Biomedical subjects

G Blasczcynski

Publications and source records attributed to G Blasczcynski.

2 recordsLinked to original sources

PubMed1983

Statistics for diagnostic procedures. I. How sensitive is "sensitivity"; how specific is "specificity"?

The terms of medical decision making (i.e., accuracy, sensitivity, specificity, predictive value, false positive/negative rates) are often seen in the radiologic literature. The interrelationships among these terms are explained, with special emphasis on the following: (1) How useful a procedure is for detecting/excluding disease depends on sensitivity, specificity, and prevalence of disease, and thus varies from practice to practice, and (2) "Accuracy" is often very misleading.

Decision Making↗

PubMed1983

Statistics for diagnostic procedures. II. The significance of "no significance": what a negative statistical test really means.

Statistical tests are often used to compare two or more groups. When the tests show "no significant difference," many authors/readers conclude that this means that the groups are identical. Often this outcome is merely the result of inadequate sample size. The adequacy of sample size depends on well established mathematical principles, not on the investigator's intuition. The real meaning of "no significant difference" is discussed.

Diagnosis↗