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W Schill

Publications and source records attributed to W Schill.

4 recordsLinked to original sources
PubMed1991

Attributable risk estimation from case-control data via logistic regression.

By fitting an unconditional logistic regression model to unmatched case-control data, an estimate of the joint population attributable risk for the factor included is obtained. This estimate and its asymptotic variance can easily be computed from the intercept parameter and its asymptotic variance. A generalization to the analysis of stratified data with large strata enables the calculation of stratum-specific attributable risks and their variances via stratum-specific intercept parameters. If sampling of cases is independent of strata, an estimate of the summary attributable risk and its asymptotic variance may be obtained as a weighted sum of the stratum-specific attributable risks.

Biometry↗
PubMed1979

Simultaneous quantitative estimates of several isotopically labelled substances in the picogram range with selected ion monitoring.

The use of a model developed by the authors for the simultaneous quantitative determination of several isotopically labelled substances of the same chemical structure is described in detail for a two substance system. A computational flow chart is included. An example using natural estradiol and 4-[14C] labelled estradiol with manifold deuterated estradiol as an internal standard is presented. The basis of the model is discussed.

Chromatography, Gas↗
PubMed1976

[Incidence of autologous spermatozoa antibodies in a group of unselected andrologic patients].

Determination of autologous sperm antibodies in the serum of 278 male adults of an unselected andrological patient material is reported. Positive test results were found in 3 patients using the macroscopic agglutination test according to Kibrick (1.1%), in 21 patients using the microscopical agglutination test according to Franklin-Dukes (7.6%), in 2 patients using the immobilization test according to Isojima (0.7%) and in 1 patient using the indirect immunofluorescence technique according to Coons and Kaplan (0.4%). Comparing the macroscopic and microscopic agglutination test a high degree of unspecific agglutinations were found in the latter excluding the microscopical agglutination test for the determination of antibodies. The relatively rare occurrence of autologous sperm antibodies in an unselected andrological patient material points to the fact that immunological methods seem to play no significant role in the diagnosis of male subfertility.

Antibody Formation↗