FAQ/powerFAQ - CBU statistics Wiki

Upload page content

You can upload content for the page named below. If you change the page name, you can also upload content for another page. If the page name is empty, we derive the page name from the file name.

File to load page content from
Page name
Comment
Type the odd characters out in each group: abz2a 125t7 HhHaHh year.s 5433r21 worl3d

Revision 74 as of 2019-01-16 12:09:14

location: FAQ / powerFAQ

Questions about p-values, significance or power of tests

  1. Can I combine pilot data with main study data?

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

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

  4. A guide to magnitudes of effect sizes

  5. Problems using p-rep, the Probability of Replication

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

  7. A note on comparing z and t statistics and their p-values?

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

  9. How do I compute Cohen's d in SPSS and EXCEL and its and eta-squared confidence interval in SPSS, R or EXCEL?

  10. How do I compute Hedge's g from Cohen's d?

  11. How do I compute Mean Square Error (MSE) in EXCEL or SPSS?

  12. A guide to obtaining confidence intervals for effect sizes

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

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

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

  16. How do I do power calculations using formulae for one sample t and sign test?

  17. General rules of thumb for sample sizes in pilot studies

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

  19. How do I compute statistical tests of equivalence?

  20. Computing Power for ANOVAs using the SPSS GLM procedure

  21. Computing Power for ANOVAs using the SPSS MANOVA procedure

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

  23. How do I calculate and interpret conditional probabilities?

  24. What is a p-value?

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

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

  27. Adjusted p-values

  28. Combining p-values by Fisher's and Stouffer's methods

  29. Summing z values and summing t-values

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