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A Schick

Publications and source records attributed to A Schick.

5 recordsLinked to original sources
PubMed1992

Two-sample nonparametric estimation and confidence intervals under truncation.

We consider point estimates and confidence intervals for the difference in location or scale between two populations when the observations are subject to truncation. We suggest procedures analogous to those for the complete-sample case. A rigorous justification is presented to support the proposed confidence interval procedure. Finally, some simulations verify the properties of the estimators and confidence intervals. We illustrate the procedure using data on tumor size.

Algorithms↗
PubMed1992

[Current problems in the study of noise effects].

This article deals with three problems. First, to what extent is the equivalent noise level valid? The halving parameter, the A-weighting, the short integration time, the fast modulations of frequency and dynamic qualities of hearing--all these aspects prove to be problematic even today. Secondly, is noise noxious to our health? It is difficult to prove that noise is detrimental to our health; many people are annoyed by noise; however, only particular groups (children, the elderly, the handicapped, people who wear a hearing aid, people with heart disease) are affected as far as health is concerned, and it is these people who require special protection. Thirdly, how harmful is the personal stereo? There are numerous indications that is harmful when not used correctly. Investigations need to be made into the role of the "Walkman" in the environment of young people.

Hearing Loss, Noise-Induced↗
PubMed1979

[Selective proximal vagotomy without drainage in uncomplicated duodenal ulcer. Technic and frequency of recurrence].

899 cases of slective promimal vagotomy were operated between 1974-1978 in the Surgical University Hospital Erlangen. The underlying disease was in all cases a chronical duodenal ulcer. The primary operative mortality was 0,6%. Intraopeatively measurements to control the sufficiency of the vagotomy Burge and Grassi proved to be necessary. We could verify by endoscopy a recurrence rate of 5,8-16,5% in the 1.-4. postoperative year. Only 58% of the recurrences could be found by x-ray investigations. 75-82% of the patients had a clinically perfect and good result. In patients with a proven recurrent ulcer there was nevertheless a good clinical result in 64%. Clinical results and complaints of the patients are therefore not sufficient as follow-up after selective proximal vagotomy and early detection of a recurrent ulcer. We believe, that one endoscopy per year is necessary.

Duodenal Ulcer↗
PubMed1979

[Experiences with selective proximal vagotomy in the treatment of chronic duodenal ulcers].

After 138 selective proximal vagotomies--130 of which were performed because of chronic duodenal ulcer--the rate of the postoperative complications was 3,8%, which is very low; the primary lethality was 0,76%. At re-examination 68% of the patients were without complaints; 8% had a recurrent ulcer. Epigastric fulness (6%), dumping (1%) and diarrhea (1%) were rare. Because of our results we believe, that selective proximal vagotomy is the optimal method for the surgical treatment of duodenal ulcer.

Duodenal Ulcer↗