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Results for “Data archiving”

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At least 163 records · Page 9Linked to original sources

PubMed2006

A geographic information systems-based, weights-of-evidence approach for diagnosing aquatic ecosystem impairment.

A Geographic Information Systems-based, watershed-level assessment using Bayesian weights of evidence (WOE) and weighted logistic regression (WLR) provides a method to determine and compare potential environmental stressors in lotic ecosystems and to create predictive models of general or species-specific biological impairment across numerous spatial scales based on limited existing sample data. The WOE/WLR technique used in the present study is a data-driven, probabilistic approach conceptualized in epidemiological research and both developed for and currently used in minerals exploration. Extrapolation of this methodology to a case-study watershed assessment of the Great and Little Miami watersheds (OH, USA) using archival data yielded baseline results consistent with previous assessments. The method additionally produced a quantitative determination of physical and chemical watershed stressor associations with biological impairment and a predicted comparative probability (i.e., favorability) of biological impairment at a spatial resolution of 0.5 km2 over the watershed study region. Habitat stressors showed the greatest spatial association with biological impairment in low-order streams (on average, 56% of total spatial association), whereas water chemistry, particularly that of wastewater effluent, was associated most strongly with biological impairment in high-order reaches (on average, 79% of total spatial association, 28% of which was attributed to effluent). Significant potential stressors varied by land-use and stream order as well as by species. This WOE/WLR method provides a highly useful "tier 1" watershed risk assessment product through the integration of various existing data sources, and it produces a clear visual communication of areas favorable for biological impairment and a quantitative ranking of candidate stressors and associated uncertainty.

Bayes Theorem↗

PubMed2006

Improving measurement in health education and health behavior research using item response modeling: introducing item response modeling.

This paper is the first of several papers designed to demonstrate how the application of item response models in the behavioral sciences can be used to enhance the conceptual and technical toolkit of researchers and developers and to understand better the psychometric properties of psychosocial measures. The papers all use baseline data from the Behavior Change Consortium data archive. This paper begins with an introduction to item response models, including both dichotomous and polytomous versions. The concepts of respondent and item location, model interpretation, standard errors and testing model fit are introduced and described. A sample analysis based on data from the self-efficacy scale is used to illustrate the concepts and techniques.

Data Interpretation, Statistical↗

PubMedDate not supplied

[The topological method of analysis of ground contamination of former nuclear test sites].

The method of topological description of former nuclear tests in demonstrated in this paper. The information about the field is extracted from the topology of 2D crossections of 3D surfaces constructed on experimental data. The complexity of izolines' system for each cross section in estimated by algebraic sum of contours bounded the areas where the field is higher then the given level. That gives a possibility to do morphological analysis of radionuclide fields using archive data and can be used for ecological diagnosis of different contaminations. The using of this method is shown on some examples.

Humans↗

PubMed1989

A cross-reference table between the Protein Data Bank of macromolecular structures and the National Biomedical Research Foundation-Protein Identification Resource amino acid sequence data bank.

The National Biomedical Research Foundation-Protein Identification Resource (NBRF-PIR) and the Protein Data Bank at Brookhaven National Laboratory (PDB) both contain protein sequences. We have prepared a cross-reference index of the sequences in these data banks, and compared the data. Of the 270 cases of sequences of the same protein appearing in both data bases, for only 31% are the sequences identical. This is often the result of a difference in the state of maturation of the proteins rather than experimental error. Nevertheless is useful to be aware that the sequence information in these two data archives should not be regarded as redundant.

Amino Acid Sequence↗

PubMed2005

Data pooling and analysis to build a preliminary item bank: an example using bowel function in prostate cancer.

Assessing bowel function (BF) in prostate cancer can help determine therapeutic trade-offs. We determined the components of BF commonly assessed in prostate cancer studies as an initial step in creating an item bank for clinical and research application. We analyzed six archived data sets representing 4,246 men with prostate cancer. Thirty-one items from validated instruments were available for analysis. Items were classified into domains (diarrhea, rectal urgency, pain, bleeding, bother/distress, and other) then subjected to conventional psychometric and item response theory (IRT) analyses. Items fit the IRT model if the ratio between observed and expected item variance was between 0.60 and 1.40. Four of 31 items had inadequate fit in at least one analysis. Poorly fitting items included bleeding (2), rectal urgency (1), and bother/distress (1). A fifth item assessing hemorrhoids was poorly correlated with other items. Our analyses supported four related components of BF: diarrhea, rectal urgency, pain, and bother/distress.

Adult↗

PubMed1996

Cancer among American-Samoans: site-specific incidence in California and Hawaii.

BACKGROUND: There is a paucity of data about cancer among American-Samoans, the largest Pacific Islander group after Hawaiians. This study provides the first data on the incidence and relative risk for all cancers among American-Samoans on the US mainland and in Hawaii. METHODS: The University of Southern California Cancer Surveillance Program and the Hawaii Tumor Registry, two population-based cancer surveillance programmes, provided archival data on American-Samoans residing in Los Angeles Country. California and in Hawaii, respectively. RESULTS: There were significant differences in the incidence and age-adjusted site-specific relative risk of cancers between American-Samoans, Hawaiians, and Anglos (non-Hispanic whites). In Hawaii, American-Samoans diagnosed with cancer compared with Hawaiians had a higher age-adjusted site-specific relative risk for cancers of the nasopharynx (especially males), liver, prostate, thyroid, and blood (especially females) and a lower relative risk for cancers of the colon, rectum (especially males), lung (especially females) and breast. Furthermore, compared with Anglos diagnosed with cancer in Hawaii, American-Samoans had a higher relative risk for cancers of the nasopharynx (especially males), stomach, liver, lung (especially males), corpus uteri, thyroid and blood, and a lower relative risk for cancers of the colon, skin, breast, testes, cervix uteri, bladder (especially males), and lymph nodes. A relatively similar profile of cancer distribution and relative risk was observed among American-Samoans and Anglos diagnosed with cancer in California. CONCLUSIONS: The data provide baseline information which has important implications for future cancer control research and prevention in this population.

Adolescent↗

PubMed1990

[Data processing the the RAST laboratory].

We describe a clinical laboratory information system for the RAST laboratory based on personal computers. In developing this system, we paid special attention to easy handling which does not require any computer experience on the user's side. Data storage and retrieval are managed by a relational database system with fast data access. Aside from the usual functions of a laboratory information system, the laboratory work is facilitated by a clear distribution of samples, the possible on-line connection to various analyzers, as well as the provision of cumulative results and a fast access to archive data.

Allergens↗

PubMed2001

A preliminary report of the virtual craniofacial center: development of Internet-/Intranet-based care coordination of pediatric craniofacial patients.

The authors present preliminary information regarding the development of an Internet-based Virtual Craniofacial Center that provides access to a patient database with visual and textual data. Patients are photographed by digital camera with standardized images. Through a Web site linked to a remote database, patient demographics, management data, reports, and acquired digital photographic images are stored and retrieved. The database can be used to sort and to present data as desired by multiple specialists. Confidentiality is maintained by unique identification numbers and password access to the server for craniofacial team members. The current system uses economical equipment (i.e., digital camera, personal computer with modem, and access to a remote Windows NT-based server), using data that can be entered in a variety of cross-platform personal computer systems and transmitted on a wide range of bandwidths-from a relatively low-bandwidth (28.8 KB per second) modem to a high-speed T-3 line connection. Long-term goals include archival data storage and analysis, as well as the development of multicenter telemedicine links for active craniofacial centers.

Child↗

PubMed2004

Distributed data mining on grids: services, tools, and applications.

Data mining algorithms are widely used today for the analysis of large corporate and scientific datasets stored in databases and data archives. Industry, science, and commerce fields often need to analyze very large datasets maintained over geographically distributed sites by using the computational power of distributed and parallel systems. The grid can play a significant role in providing an effective computational support for distributed knowledge discovery applications. For the development of data mining applications on grids we designed a system called Knowledge Grid. This paper describes the Knowledge Grid framework and presents the toolset provided by the Knowledge Grid for implementing distributed knowledge discovery. The paper discusses how to design and implement data mining applications by using the Knowledge Grid tools starting from searching grid resources, composing software and data components, and executing the resulting data mining process on a grid. Some performance results are also discussed.

Algorithms↗

PubMed1990

[Around the Semipalatinsk proving grounds: the radioecological situation and the population radiation doses in Semipalatinsk Province (based on data from the report of the Interdepartmental Commission)].

The paper represents some results of a joint commission, organized by the USSR Ministry of Health by order of the USSR Council of Ministers at public requests. The commission worked in the area neighbouring the proving ground at Semipalatinsk in the period of May-July 1988. A radiological situation there was investigated after underground nuclear testing on July 8, 1989. The results of measurements and archive data were used to estimate doses of radiation exposure of the population in the period of 1949 (nuclear testing on the ground and in the atmosphere) and in the period of underground testing, It was shown that in the period of 1949-1963 approximately 10,000 people received increased doses of external and internal irradiation. A high level of radiation-induced chromosome aberrations was noted among them. The highest effective equivalent doses of external and internal irradiation were received by the residents in the villages of Folon' (1.6 Gy during the first testing in 1949), Karaul (0.37 Gy), Sarzhal (0.20 Gy), Semenovka (0.02 Gy). The annual effective equivalent doses at that period did not exceed 0.0056 Gy (the highest value) for the Semipalatinsk residents. Proceeding from the values of collective doses probable long-term effects (malignant tumors) were assessed. Recommendations and conclusions of the commission are presented.

Ecology↗

PubMed1995

Rural migration and agrarian reform in Russia: a research note.

This study focuses primarily on trends in rural-urban migration in Russia and the former Soviet Union. "New data suggest that a historic shift in migration patterns is underway in Russia, a change that may have profound long-term effects on agrarian reform and the nature of the Russian countryside. We begin with a short review of past rural migration trends and the rural demographic situation, in part using archival data for an oblast in central Russia. We will then present new data on rural migration. Finally, we assess the implications of rural migratory trends for agrarian reform in Russia."

Agriculture↗

PubMed1997

Collecting retrospective data: accuracy of recall after 50 years judged against historical records.

Recent interest in a lifecourse perspective on health inequalities will rekindle concerns about the accuracy of retrospective data. The present paper demonstrates that recalled information on some types of social circumstances can be obtained with a useful degree of accuracy using an interview technique which helps to minimize recall bias. Lifegrid information about social circumstances during their youth and childhood was collected from 57 subjects in early old age and compared with archive material of the same subjects' social circumstances recorded 50 years previously. A comparison of interview with archive data revealed that a substantial majority of subjects had recalled simple socio-demographic information after a period of 50 years with a useful degree of accuracy. Within lifecourse research, it is concluded, carefully collected retrospective data offer a valuable complement to birth cohort studies, provided that such usage is sensitive to the types of items of information which can, and can not, be recalled accurately.

Aged↗

PubMed2000

Fiesta as tradition, fiesta as change: ritual, alcohol and violence in a Mexican community.

AIMS: To explore the traditional Mexican religious fiesta as a primary locus for community-based excessive drinking and violence against women. The research argues that the pattern of drinking and violence cannot be placed within explanations that tie a breakdown in social norms to drinking nor drinking to a breakdown in social norms. DESIGN: The data were gathered over 14 continuous months of participant observation in 1995 and 1996, followed by two summer research projects in 1997 and 1998. The researcher documented the activities of the participants at each fiesta and followed-up each event with interviews of the parties involved in violent confrontations. In addition, life stories and archival data on violence were conducted and used to situate current findings against historical data. SETTING: All data were collected in the community of Santa Maria Atzompa. Atzompa is a cabécera or municipal seat, for six colonias (large neighborhoods), and three ranchos (agriculturally based communities) and has a population of just over 5200. The main community of Atzompa, where most of the research was conducted, has a population of 2700+. PARTICIPANTS: Over 1000 individuals participated in community religious fiestas that the researcher attended. More than half of these were men, and almost all the men present participated in the binge drinking. MEASUREMENTS: Sixteen religious fiestas and 13 non-religious fiestas were documented through participant observation and photographs. FINDINGS: In every religious-based fiesta, violence erupted and was directed primarily against women. Husband and wife abuse accounted for 10 of the 16 violent disruptions (63%) while male/male abuse accounted for six (38%). CONCLUSIONS: The perpetuation of binge drinking and violence are part of a historic cycle of male dominance that dates back to the introduction of alcohol distillation during colonization by the Spaniards in the 16th century, compounded today by frustration over their inability to control the economic and political aspects of their households and community. Women's acquiescence to the violence is a form of mediation over male frustrations that allow women to continue in their roles as economic providers.

Alcohol Drinking↗

PubMed1982

Requests for retrieval of laboratory results from archive.

The design of laboratory archives depends to a large extent on frequency and type of access required. This article reports a study in which all requests for laboratory archival data were tabulated carefully. Such requests are infrequent and usually involve specific test results. An inexpensive, efficient, and convenient method of storing such data is described, employing a laboratory computer and magnetic tape-to-microfiche software. The efficiency of this system permits indefinite storage which may be desirable in view of the medico-legal climate.

Archives↗

PubMedDate not supplied

[Digital x-ray system (data collection, processing, storage and transmission of diagnostic information)].

The paper deals with the system that allows the conventional procedures for obtaining diagnostic X-ray images to be integrated with direct digital ones. It presents patterns of introducing digital roentgenography into practical medicine and describes the system how diagnostic X-ray images are obtained, processed, stored, and transmitted, which consists of automatic working places for X-ray laboratory assistant and an X-ray physician. The requirements for long-term diagnostic archives data base and for the software support of input of the data accompanying each X-ray film are discussed in the paper. The information presented reflects the authors' experience in using the system in a multidisciplinary hospital having an unselected stream of patients (n = 6,000).

Hospitals↗

PubMed2006

Optimizing the ongoing search for new treatments for Parkinson disease: using futility designs.

Many agents are being considered for treatment of Parkinson disease (PD). Given the large number of agents and the limited resources to evaluate new agents, it is essential to reduce the likelihood of advancing ineffective agents into large, long-term Phase III trials. Futility design methodology addresses this goal. The authors describe how a single-arm Phase II futility study uses a short-term outcome to compare a treatment group response to a predetermined hypothesized or historically based control response. The authors present advantages and limitations of futility designs along with examples derived from the data archive of a large Phase III efficacy study of treatments to delay PD progression, the Deprenyl And Tocopherol Antioxidative Therapy Of Parkinsonism (DATATOP) trial. Using the same control progression rate and treatment effect assumptions used to power the original DATATOP trial, the authors calculated the number of subjects needed to conduct two 12-month futility studies. DATATOP was designed to enroll 800 patients. Using data on 124 consecutive subjects randomized into each of the DATATOP treatment groups, the authors identified tocopherol as futile and deprenyl as worthy of further study. Using Phase II information, DATATOP could have been simplified from a 2 x 2 factorial design to a comparison of deprenyl vs placebo. While not testing efficacy, futility designs provide a strategy for discarding treatments unlikely to be effective in Phase III. A limitation is the dependence on historical data or hypothesized outcomes for untreated controls. Futility studies may decrease the time to identify treatments unworthy of further pursuit and reduce subjects' exposure to futile treatments.

Antiparkinson Agents↗

PubMed2005

Farm health surveillance in the Marshfield Epidemiologic Study Area: a pilot study.

Surveillance of agricultural work-related illness and non-fatal injuries is limited and considered to be a major gap in prevention and policy-making capacity. This pilot study evaluated the utility of the Marshfield Epidemiologic Study Area (MESA) and its farm residency cohort to identify and monitor potential priorities for prevention and control. MESA is a defined geographic region that serves as a resource for conducting population-based health research. Nearly all of the residents receive their health care from the Marshfield Clinic and affiliated hospitals, providing archived electronic medical information to characterize past and present diagnoses. Based on scientific literature and national research priorities, five broad health issues (injuries, back problems, hearing loss, respiratory conditions, and dermatologic conditions) were selected. To estimate age-specific and age-adjusted incidence and prevalence, we followed a fixed cohort of 1995 MESA residents through 2002. Standardized incidence ratios and standardized prevalence ratios were also estimated to quantify the potential impact of farm residency. Linking MESA, its farm residency cohort, and the clinic's data archives allowed successful identification of significant associations with agricultural exposure for a few conditions and subconditions related to consensus priorities in agricultural health, particularly among men. These included extrinsic alveolitis, organic dust toxic syndrome, back pain, osteoarthrosis, and certain injuries. However, the system was generally not able to demonstrate strong influence of farm residency on disease occurrence for many conditions specifically selected for their likely capacity to show such influence. Future surveillance systems should supplement clinical data with other sources of information on health events and should be adequately powered to focus on narrower ranges of health conditions.

Adult↗

PubMedDate not supplied

An analysis of allegations of sexual abuse in a multi-victim day-care center case.

Sexual abuse in day-care centers is a phenomenon of increasing concern, both in terms of its prevalence and its serious effects on child victims. Legal intervention in this area is problematic because criminal investigations are usually beset with difficulties: Characteristics of children and of the abuse situation affect disclosure rates and credibility. Research on children as witnesses is amassing; however, so far, little systematic analysis has been conducted on multi-victim child sexual abuse cases. The present study concerns a case of sexual abuse in a day-care center with over 100 alleged victims. Criteria derived from Statement Validity Analysis (SVA) protocols were applied to aggregate record review data to assess the veritability of the abuse allegations. Individual children's abuse disclosures were also analyzed, vis-à-vis characteristics of the children (age, gender, recency of attendance) and of the investigation (agency doing the interview, number of interviews, use of anatomically detailed dolls). The use of SVA criteria supported the veritability of allegations in this day-care abuse case. Even acknowledging the limitations of archival data collected for other purposes, the aggregate data analysis reflected consistency, logical structure, and spontaneity; however, little evidence of accommodation was found. Multivariate comparison of disclosing and nondisclosing children found an unexpected inverse relationship of disclosure with age, as well as positive associations with number of interviews and use of dolls. Alternative interpretations of these results are discussed.

Age Factors↗