Can I combine pilot data with main study data?
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 guide to magnitudes of effect sizes
Problems using p-rep, the Probability of Replication
A quick guide to choice of sample sizes for Cohen's effect sizes
A note on comparing z and t statistics and their p-values?
How do I convert a t-statistic (and an Odds Ratio) into an effect size?
How do I compute Cohen's d in SPSS and EXCEL and its and eta-squared confidence interval in SPSS, R or EXCEL?
How do I compute Hedge's g from Cohen's d?
How do I compute Mean Square Error (MSE) in EXCEL or SPSS?
A guide to obtaining confidence intervals for effect sizes
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?
General rules of thumb for sample sizes in pilot studies
How do I work out sample size for apriori specificities and sensitivities?
How do I compute statistical tests of equivalence?
Computing Power for ANOVAs using the SPSS GLM procedure
Computing Power for ANOVAs using the SPSS MANOVA procedure
How do I do False Discovery Rate (FDR) corrections for multiple tests?
How do I calculate and interpret conditional probabilities?
What is a p-value?
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?
Combining p-values by Fisher's and Stouffer's methods
Summing z values and summing t-values
Why does the value of one in the F distribution have a p-value which is less than 1?