## FAQs for analysis of variance

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

- [:FAQ/ttestEXC:How do I compare a mean to a constant in EXCEL (one-sample t)?]
- [:FAQ/df:How do I work out degrees of freedom for terms in an ANOVA?]
- [:FAQ/E:What does a number containing an 'E' signify and how do I remove it?]
[:FAQ/SumsOfSquaresTypes:In ANOVA and Regression, what do the various different types of Sums of Squares mean, and does the choice matter?]

- [:FAQ/subsrandom:Can I use subjects as a random or fixed factor in an ANOVA?]
[:FAQ/Rss:Sums of squares used by R in lm, lmer and aov]

- [:FAQ/wmeans:A note about unequal group sizes in ANOVA]
- [:FAQ/sstypes:A note about different sums of squares in unbalanced factorial ANOVAs]
- [:FAQ/FVars: What is the variance of the mean of my transformed data?]
- [:FAQ/VarMSE: What is the value of the error variance for raw data using that of its scalar transformed data?]
- [:FAQ/rmform: How do I format data for input into a repeated measures analysis in SPSS?]
- [:FAQ/transp: What does the TRANSPOSE ALL DATA option in the RESTRUCTURE menu do in SPSS?]
- [: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).]
- [:FAQ/glmrm: How do I perform a repeated measures analysis of variance in SPSS?]
- [:FAQ/anovaR: How do I perform a repeated measures analysis of variance in R including correcting for sphericity?]
- [:FAQ/rpcon: How do I perform a non-standard comparison of means in a repeated measures anova in SPSS?]
- [:FAQ/bwss: What is the effect of dropping a between by within subjects interaction on other terms in a mixed anova?]
[:FAQ/Interaction:How do I work out the meaning of a significant interaction?]

- [:FAQ/ancreg:Can I do an analysis of covariance using a regression?]
- [:FAQ/constantcov:Inappropriate use of a constant covariate in repeated measures ANCOVA]
[:FAQ/Manova:How do I adjust for varying covariates in a repeated measures ANOVA in SPSS?]

- [:FAQ/WsubEffects: What is the difference between within subjects effects and within subjects contrasts in SPSS?]
- [:FAQ/Auc: What summary measures can I use to describe repeated measures?]
- [:FAQ/polybs: How do I test for a trend between group means representing different subjects?]
- [:FAQ/Tukey: How do I interpret subsets in Tukey's HSD output?]
- [:FAQ/TukeyKramer: How do I compare all pairwise comparisons in a between subjects anova (and in a repeated measures anova)?]
[:FAQ/SimpleMainEffects:Why won't SPSS let me do post hoc tests involving a within-subjects factor?]

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

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

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

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

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

- [:FAQ/orthopolys:Fitting linear orthogonal polynomials]
- [:FAQ/lincon:How do I compare group means in a non-standard post-hoc contrast?]
- [:FAQ/ss:Formulae for interaction sums of squares in balanced designs]