## Errors and P-value

Statistical hypotheses Null hypothesis (H0): No difference or relation exists; e.g. Treatment A is not better than Treatment B Alternative or research hypothesis (H1): Some…

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## Unforget Baye’s theorem derived PPV and NPV

Let’s unveil the mathematics behind the relation between: Prevalence (Pre-test probability) Predictive value (Post-test probability) Sensitivity Specificity SYMBOLS: Total screened population = nPrevalence = PSensitivity…

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## Screening tests in Series and Parallel

A. Parallel testing 2 screening tests are applied simultaneously: Disease positives: Test positive in either of the two tests (If one test is negative, still…

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## Which statistical test to use?

Steps: Determine the types of data Determine the number of samples If two samples: are they independent groups or related (matched) groups? Choose the test…

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