FAQ/mvFAQ542017-09-12 14:40:29PeterWatson532017-01-31 16:59:08PeterWatson522015-01-20 14:34:12PeterWatson512014-09-10 09:09:57PeterWatson502013-03-26 16:12:11PeterWatson492013-03-08 10:17:31localhostconverted to 1.6 markup482011-09-09 12:15:15PeterWatson472011-09-09 12:14:04PeterWatson462011-01-12 14:51:03PeterWatson452011-01-12 14:50:40PeterWatson442010-11-23 16:19:24PeterWatson432010-11-23 16:19:03PeterWatson422010-07-01 15:08:33PeterWatson412010-07-01 14:30:56PeterWatson402009-11-17 17:01:14PeterWatson392009-11-16 12:00:26PeterWatson382009-01-30 11:27:57PeterWatson372009-01-30 10:36:17PeterWatson362009-01-30 09:44:15PeterWatson352008-03-07 12:36:01PeterWatson342008-03-06 15:38:09PeterWatson332008-01-23 15:22:27PeterWatson322008-01-22 12:51:06PeterWatson312008-01-22 12:50:38PeterWatson302008-01-21 13:14:32PeterWatson292008-01-21 13:11:00PeterWatson282007-12-06 11:41:13PeterWatson272007-11-30 10:04:01PeterWatson262007-11-30 09:51:07PeterWatson252007-11-29 12:24:37PeterWatson242007-11-29 12:24:21PeterWatson232007-11-16 10:51:34PeterWatson222007-11-16 10:24:10PeterWatson212007-10-03 14:18:47PeterWatson202007-08-13 15:18:36PeterWatson192007-08-13 15:17:57PeterWatson182007-07-04 12:46:35PeterWatson172007-07-04 12:45:06PeterWatson162007-06-18 16:09:20PeterWatson152007-06-18 16:09:06PeterWatson142007-06-05 14:06:06PeterWatson132007-03-13 15:31:12PeterWatson122007-02-22 11:19:53PeterWatson112007-02-15 16:43:13PeterWatson102007-02-14 16:31:11PeterWatson92007-01-25 12:16:17PeterWatson82007-01-25 12:15:44PeterWatson72007-01-25 12:15:32PeterWatson62007-01-05 10:57:06PeterWatson52006-10-25 16:04:35PeterWatson42006-10-25 16:03:41PeterWatson32006-10-25 16:02:54PeterWatson22006-09-29 13:18:11PeterWatson12006-09-29 13:06:57PeterWatsonQuestions about multivariate analysesWhat is heterogeneity of variance in SPSS Probit and Logit procedures? 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) What is collinearity in multiple regression, and what do I do about it? How do I find the condition number of a matrix using R? Is there an optimal ratio of cases to predictor variables I should have before performing a multivariate analysis or any guide as to total sample size? Which matrix of loadings do I use doing a principal components extraction or non-PC analysis with a direct oblimin rotation when doing a factor analysis? A guide to the pros and cons of choosing a method for producing factor scores from a factor analysis What thresholds should I use for factor loading cut-offs? How do I compare a pair of factor loadings? What is the difference between principal components analysis, principal axis analysis and other factor extraction methods? How many factors should I retain in a factor analysis? A note on Cronbach's Alpha. How do I interpret variables which load on more than one factor? What is multidimensional scaling and how do I do it? What is canonical correlation and where can I use it? When should I use a Multivariate Analysis of Variance (MANOVA)? Why are the standard errors so large in logistic regression? How do I choose between different logistic regression models? How do I perform a cluster analysis in R? Which discriminant analysis should I use to obtain thresholds to indicate levels of abnormality using a single variable? How do I assess the importance of variables in a Normal Discriminant analysis? Can you recommend any two group discriminant diagnostics? Which output criteria should I use when using the casewise results option with the Normal discriminant method in SPSS? How do I plot and interpret a ROC curve in assessing strength in two group prediction? How do I handle missing data in multivariate analyses in SPSS? Using SPSS syntax to impute last observation carried forward (LOCF) for missing values in SPSS How do I find complete cases in SPSS and R? How can I detect identical (duplicate) cases in SPSS without having an ID number? What is Euclidean distance and how do I compute it? How do I detect multivariate outliers? Structural equation modelling in R Can you recommend any statistical textbooks? How do I check for multivariate normality? What do I do if I have unequal group covariance matrices when doing a MANOVA?