== Questions about multivariate analyses ==


 1. [:FAQ/heterogeneity: What is heterogeneity of variance in SPSS Probit and Logit procedures?]


 1. [:FAQ/SobelTest:How do I test whether one independent variable has an influence on a dependent variable other than via the mediation of a second independent variable? (Sobel Test)]

 1. [:FAQ/Collinearity:What is collinearity in multiple regression, and what do I do about it?]

 1. [:FAQ/condnoR: How do I find the condition number of a matrix using R?]

 1. [:FAQ/RatCaseVar:Is there an optimal ratio of cases to predictor variables I should have before performing a multivariate analysis?]
 
 1. [:FAQ/patternMatrix: Which matrix of loadings do I use doing a principal components or factor analysis with a direct oblimin rotation?]

 1. [:FAQ/NoFactors: How many factors/components should I retain in a factor/principal components analysis?]

 1. [:FAQ/PlusFac: How do I interpret  variables which load on more than one factor?]

 1. [:FAQ/mds: What is multidimensional scaling and how do I do it?]

 1. [:FAQ/cancorr: What is canonical correlation and where can I use it?]

 1. [:FAQ/MANOVA:When should I use a Multivariate Analysis of Variance (MANOVA)?]

 1. [:FAQ/infmles:Why are the standard errors so large in logistic regression?]

 1. [:FAQ/threshold:Which discriminant analysis should I use to obtain thresholds to indicate levels of abnormality using a single variable?]

 1. [:FAQ/structure:How do I assess the importance of variables in a Normal Discriminant analysis?]

 1. [:FAQ/criteria:Can you recommend any two group discriminant diagnostics?]

 1. [:FAQ/roc:How do I plot and interpret a ROC curve in assessing strength in two group prediction?]

 1. [:FAQ/missing:How do I handle missing data in multivariate analyses in SPSS?]

 1. [:FAQ/lag:How can I detect identical cases in SPSS without having an ID number?]

 1. [:FAQ/texts: Can you recommend any statistical textbooks?]