FAQ/anovaFAQ - CBU statistics Wiki

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FAQs for analysis of variance

  1. [:FAQ/Sattherthwaite:Why are the degrees of freedom not whole numbers?]

  2. [:FAQ/ttestEXC:How do I compare a mean to a constant in EXCEL (one-sample t)?]
  3. [:FAQ/ciplots:How do I calculate a 95% confidence interval for the group means from one-way ANOVAs (using either a within or between subjects factor)?]
  4. [:FAQ/ttst:How do I compute a t-test and F ratio using only summary measures in 2x2 between and within subjects ANOVA?]
  5. [:FAQ/df:How do I work out degrees of freedom for terms in an ANOVA?]
  6. [:FAQ/E:What does a number containing an 'E' signify and how do I remove it?]

  7. [:FAQ/SumsOfSquaresTypes:In ANOVA and Regression, what do the various different types of Sums of Squares mean, and does the choice matter?]

  8. [:FAQ/subsrandom:Can I use subjects as a random or fixed factor in an ANOVA?]

  9. [:FAQ/Rss:Sums of squares used by R in lm, lmer and aov]

  10. [:FAQ/wmeans:A note about unequal group sizes in ANOVA]
  11. [:FAQ/sstypes:A note about different sums of squares in unbalanced factorial ANOVAs]
  12. [:FAQ/FVars: What is the variance of the mean of my transformed data?]
  13. [:FAQ/VarMSE: What is the value of the error variance for raw data using that of its scalar transformed data?]
  14. [:FAQ/rmform: How do I format data for input into a repeated measures analysis in SPSS?]
  15. [:FAQ/transp: What does the TRANSPOSE ALL DATA option in the RESTRUCTURE menu do in SPSS?]
  16. [:FAQ/restwb: Using the VARSTOCASES command in SPSS to convert repeated measures formatted data to a multilevel model format (and the CASESTOVARS command for the reverse operation).]
  17. [:FAQ/glmrm: How do I perform a repeated measures analysis of variance in SPSS?]
  18. [:FAQ/glm99rm: How do I perform a repeated measures analysis of variance in SPSS involving repeated measures factors with more than 99 levels?]
  19. [:FAQ/anovaR: How do I perform a repeated measures analysis of variance in R including correcting for sphericity?]
  20. [:FAQ/aovgens: How do I perform a repeated measures analysis of variance in GENSTAT (and R)?]
  21. [:FAQ/aovmtb: How do I perform a repeated measures analysis of variance in MINITAB (and use this approach to obtain post-hoc tests on a repeated measures factor in SPSS)?]
  22. [:FAQ/rpcon: How do I perform a non-standard comparison of means in a repeated measures anova in SPSS?]
  23. [:FAQ/bwss: What is the effect of dropping a between by within subjects interaction on other terms in a mixed anova?]

  24. [:FAQ/Interaction:How do I work out the meaning of a significant interaction?]

  25. [:FAQ/Int4:How do I interpret a four-way interaction?]
  26. [:FAQ/ancreg:Can I do an analysis of covariance using a regression (including computation of covariate adjusted means) and use this to adjust for regression to the mean?]
  27. [:FAQ/constantcov:Inappropriate use of a constant covariate in repeated measures ANCOVA]

  28. [:FAQ/Manova:How do I adjust for varying covariates in a repeated measures ANOVA in SPSS?]

  29. [:FAQ/Manzeroes:How do I obtain an interaction in SPSS to describe how a fixed covariate influences a repeated measures interaction?]

  30. [:FAQ/WsubEffects: What is the difference between within subjects effects and within subjects contrasts in SPSS?]
  31. [:FAQ/Auc: What summary measures can I use to describe repeated measures?]
  32. [:FAQ/polybs: How do I test for a trend between group means representing different subjects?]
  33. [:FAQ/Tukey: How do I interpret subsets in Tukey's HSD output?]
  34. [:FAQ/TukeyKramer: How do I compare all pairwise comparisons in a between subjects anova (and in a repeated measures anova)?]

  35. [:FAQ/SimpleMainEffects:Why won't SPSS let me do post hoc tests involving a within-subjects factor?]

  36. [:FAQ/SimpleEffs:How do I do a simple effects analysis in SPSS?]

  37. [:FAQ/pvs:How do I adjust p-values for number of comparisons using SPSS, R or in a spreadsheet?]

  38. [:FAQ/SpssBonferroni:Adjusted p-values]

  39. [:FAQ/RepeatedMeasuer:Repeated measures, Mixed models and Split-plot designs: A Rant]

  40. [:FAQ/ResidsRepMeas:How do I check Normality assumptions in repeated measures analyses in SPSS?]

  41. [:FAQ/Mauchly:What is the formula for Mauchly's W used for testing sphericity in univariate repeated measures anova?]

  42. [:FAQ/orthopolys:Fitting linear orthogonal polynomials]
  43. [:FAQ/lincon:How do I compare group means in a non-standard post-hoc contrast?]

  44. [:FAQ/Dunnett:How do I compare a set of group means with a control group mean?]

  45. [:FAQ/intsg:How do I manually compute t-statistics to compare means in a repeated measures ANOVA having 3 or more groups?]
  46. [:FAQ/ss:Formulae for interaction sums of squares in balanced designs]