## Questions about p-values, significance or power of tests

When and how do I evaluate a one-sided p-value and quote a one-sided 95% confidence interval?

What sample sizes do I need for doing tests with a given power?

A quick guide to choice of sample sizes for Cohen's effect sizes

How do I convert a t-statistic (and an Odds Ratio) into an effect size?

How do I compute effect sizes (including variance adjusted ones)?

How do I do power calculations in SPSS, R, EXCEL and using web freeware?

How do I do power (sample size) calculations on Poisson counts?

How do I do power calculations using formulae for one sample t and sign tests?

How do I work out sample size for apriori specificities and sensitivities?

How do I do False Discovery Rate (FDR) corrections for multiple tests?

How do I find p-values using critical values as input in SPSS and EXCEL?

How do I adjust p-values for number of comparisons using SPSS and R?

Why does the value of one in the F distribution have a p-value which is less than 1?