MedicalStat

## Formulas

Note: In the formulas the symbol $$\ln(x)$$ is the natural logarithm. In other words the inverse function of $$\text{e}^x = \exp(x)$$ meaning that $$\ln(\text{e}^x) = x$$ and that $$\text{e}^{\ln(x)} = x$$. In some text books, $$\ln(x)$$ is written as $$\log(x)$$. The expression $$\log(x)$$ is, however, normally attributed to the base-10-logarithm, not the natural logarithm.

The symbol $$|x|$$ is the numerical value of a number. The numerical value is always positive. For ex. $$|3-5| = |-2| = 2$$ and $$|5-3| = |2| = 2$$.

 Risk and Odds Sensitivity and Specificity Means Confidence Intervals Chi Square Test / GOF Test Weighted Average Data Analysis Rates Mantel-Haenszel Stratified OR Mann-Whitney (Wilcoxon) U Test Regression Power & Sample Size

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Risk and Odds

Sensitivity & Specificity

Means

Confidence Intervals

Chi-Square-Test

Weighted Average

Data Analysis

Rates

Mantel-Haenszel Stratified OR

Mann-Whitney (Wilcoxon) U Test

Regression

Power & Sample Size