Diff for "FAQ/mvFAQ" - CBU statistics Wiki
location: Diff for "FAQ/mvFAQ"
Differences between revisions 48 and 49
Revision 48 as of 2011-09-09 12:15:15
Size: 2994
Editor: PeterWatson
Comment:
Revision 49 as of 2013-03-08 10:17:31
Size: 3025
Editor: localhost
Comment: converted to 1.6 markup
Deletions are marked like this. Additions are marked like this.
Line 5: Line 5:
 1. [:FAQ/heterogeneity: What is heterogeneity of variance in SPSS Probit and Logit procedures?]  1. [[FAQ/heterogeneity| What is heterogeneity of variance in SPSS Probit and Logit procedures?]]
Line 7: Line 7:
 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/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)]]
Line 9: Line 9:
 1. [:FAQ/Collinearity:What is collinearity in multiple regression, and what do I do about it?]  1. [[FAQ/Collinearity|What is collinearity in multiple regression, and what do I do about it?]]
Line 11: Line 11:
 1. [:FAQ/condnoR: How do I find the condition number of a matrix using R?]  1. [[FAQ/condnoR| How do I find the condition number of a matrix using R?]]
Line 13: Line 13:
 1. [:FAQ/RatCaseVar:Is there an optimal ratio of cases to predictor variables I should have before performing a multivariate analysis?]  1. [[FAQ/RatCaseVar|Is there an optimal ratio of cases to predictor variables I should have before performing a multivariate analysis?]]
Line 15: Line 15:
 1. [:FAQ/patternMatrix: 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?]  1. [[FAQ/patternMatrix| 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?]]
Line 17: Line 17:
 1. [:FAQ/thresholds: What thresholds should I use for factor loading cut-offs?]  1. [[FAQ/thresholds| What thresholds should I use for factor loading cut-offs?]]
Line 19: Line 19:
 1. [:FAQ/congruenceC: How do I compare a pair of factor loadings?]  1. [[FAQ/congruenceC| How do I compare a pair of factor loadings?]]
Line 21: Line 21:
 1. [:FAQ/compare: What is the difference between principal components analysis, principal axis analysis and other factor extraction methods?]  1. [[FAQ/compare| What is the difference between principal components analysis, principal axis analysis and other factor extraction methods?]]
Line 23: Line 23:
 1. [:FAQ/NoFactors: How many factors should I retain in a factor analysis?]  1. [[FAQ/NoFactors| How many factors should I retain in a factor analysis?]]
Line 25: Line 25:
 1. [:FAQ/Cronbach: A note on Cronbach's Alpha.]  1. [[FAQ/Cronbach| A note on Cronbach's Alpha.]]
Line 27: Line 27:
 1. [:FAQ/PlusFac: How do I interpret variables which load on more than one factor?]  1. [[FAQ/PlusFac| How do I interpret variables which load on more than one factor?]]
Line 29: Line 29:
 1. [:FAQ/mds: What is multidimensional scaling and how do I do it?]  1. [[FAQ/mds| What is multidimensional scaling and how do I do it?]]
Line 31: Line 31:
 1. [:FAQ/cancorr: What is canonical correlation and where can I use it?]  1. [[FAQ/cancorr| What is canonical correlation and where can I use it?]]
Line 33: Line 33:
 1. [:FAQ/MANOVA:When should I use a Multivariate Analysis of Variance (MANOVA)?]  1. [[FAQ/MANOVA|When should I use a Multivariate Analysis of Variance (MANOVA)?]]
Line 35: Line 35:
 1. [:FAQ/infmles:Why are the standard errors so large in logistic regression?]  1. [[FAQ/infmles|Why are the standard errors so large in logistic regression?]]
Line 37: Line 37:
 1. [:FAQ/logrrsq:How do I choose between different logistic regression models?]  1. [[FAQ/logrrsq|How do I choose between different logistic regression models?]]
Line 39: Line 39:
 1. [:FAQ/threshold:Which discriminant analysis should I use to obtain thresholds to indicate levels of abnormality using a single variable?]  1. [[FAQ/threshold|Which discriminant analysis should I use to obtain thresholds to indicate levels of abnormality using a single variable?]]
Line 41: Line 41:
 1. [:FAQ/structure:How do I assess the importance of variables in a Normal Discriminant analysis?]  1. [[FAQ/structure|How do I assess the importance of variables in a Normal Discriminant analysis?]]
Line 43: Line 43:
 1. [:FAQ/criteria:Can you recommend any two group discriminant diagnostics?]  1. [[FAQ/criteria|Can you recommend any two group discriminant diagnostics?]]
Line 45: Line 45:
 1. [:FAQ/NDcasestat:Which output criteria should I use when using the casewise results option with the Normal discriminant method in SPSS?]  1. [[FAQ/NDcasestat|Which output criteria should I use when using the casewise results option with the Normal discriminant method in SPSS?]]
Line 47: Line 47:
 1. [:FAQ/roc:How do I plot and interpret a ROC curve in assessing strength in two group prediction?]  1. [[FAQ/roc|How do I plot and interpret a ROC curve in assessing strength in two group prediction?]]
Line 49: Line 49:
 1. [:FAQ/missing:How do I handle missing data in multivariate analyses in SPSS?]  1. [[FAQ/missing|How do I handle missing data in multivariate analyses in SPSS?]]
Line 51: Line 51:
 1. [:FAQ/cc:How do I find complete cases in SPSS and R?]  1. [[FAQ/cc|How do I find complete cases in SPSS and R?]]
Line 53: Line 53:
 1. [:FAQ/lag:How can I detect identical cases in SPSS without having an ID number?]  1. [[FAQ/lag|How can I detect identical cases in SPSS without having an ID number?]]
Line 55: Line 55:
 1. [:FAQ/euclid:What is Euclidean distance and how do I compute it?]  1. [[FAQ/euclid|What is Euclidean distance and how do I compute it?]]
Line 57: Line 57:
 1. [:FAQ/mahal:How do I detect multivariate outliers?]  1. [[FAQ/mahal|How do I detect multivariate outliers?]]
Line 59: Line 59:
 1. [:FAQ/sem:Structural equation modelling in R]  1. [[FAQ/sem|Structural equation modelling in R]]
Line 61: Line 61:
 1. [:FAQ/texts: Can you recommend any statistical textbooks?]  1. [[FAQ/texts| Can you recommend any statistical textbooks?]]
Line 63: Line 63:
 1. [:FAQ/mvnormc: How do I check for multivariate normality?]  1. [[FAQ/mvnormc| How do I check for multivariate normality?]]
Line 65: Line 65:
 1. [:FAQ/uneqcovs:What do I do if I have unequal group covariance matrices when doing a MANOVA?]  1. [[FAQ/uneqcovs|What do I do if I have unequal group covariance matrices when doing a MANOVA?]]

Questions about multivariate analyses

  1. What is heterogeneity of variance in SPSS Probit and Logit procedures?

  2. 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)

  3. What is collinearity in multiple regression, and what do I do about it?

  4. How do I find the condition number of a matrix using R?

  5. Is there an optimal ratio of cases to predictor variables I should have before performing a multivariate analysis?

  6. 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?

  7. What thresholds should I use for factor loading cut-offs?

  8. How do I compare a pair of factor loadings?

  9. What is the difference between principal components analysis, principal axis analysis and other factor extraction methods?

  10. How many factors should I retain in a factor analysis?

  11. A note on Cronbach's Alpha.

  12. How do I interpret variables which load on more than one factor?

  13. What is multidimensional scaling and how do I do it?

  14. What is canonical correlation and where can I use it?

  15. When should I use a Multivariate Analysis of Variance (MANOVA)?

  16. Why are the standard errors so large in logistic regression?

  17. How do I choose between different logistic regression models?

  18. Which discriminant analysis should I use to obtain thresholds to indicate levels of abnormality using a single variable?

  19. How do I assess the importance of variables in a Normal Discriminant analysis?

  20. Can you recommend any two group discriminant diagnostics?

  21. Which output criteria should I use when using the casewise results option with the Normal discriminant method in SPSS?

  22. How do I plot and interpret a ROC curve in assessing strength in two group prediction?

  23. How do I handle missing data in multivariate analyses in SPSS?

  24. How do I find complete cases in SPSS and R?

  25. How can I detect identical cases in SPSS without having an ID number?

  26. What is Euclidean distance and how do I compute it?

  27. How do I detect multivariate outliers?

  28. Structural equation modelling in R

  29. Can you recommend any statistical textbooks?

  30. How do I check for multivariate normality?

  31. What do I do if I have unequal group covariance matrices when doing a MANOVA?

None: FAQ/mvFAQ (last edited 2017-09-12 14:40:29 by PeterWatson)