170 What are the differences between Factor Analysis and Principal Component Analysis? 2010-08-12T03:46:05.987

61 Is there any good reason to use PCA instead of EFA? Also, can PCA be a substitute for factor analysis? 2014-11-07T10:56:41.293

57 What is the relationship between independent component analysis and factor analysis? 2012-08-29T13:10:37.060

52 Is PCA followed by a rotation (such as varimax) still PCA? 2010-07-25T14:31:31.773

30 How does Factor Analysis explain the covariance while PCA explains the variance? 2014-04-24T14:15:24.080

27 Does the sign of scores or of loadings in PCA or FA have a meaning? May I reverse the sign? 2014-03-05T12:30:05.707

24 Minimum sample size for PCA or FA when the main goal is to estimate only few components? 2012-12-13T06:37:08.683

22 Doing principal component analysis or factor analysis on binary data 2011-10-01T18:39:16.607

22 Best factor extraction methods in factor analysis 2013-02-24T14:36:08.563

18 What is the intuitive reason behind doing rotations in Factor Analysis/PCA & how to select appropriate rotation? 2015-05-10T14:40:43.127

18 Is there Factor analysis or PCA for ordinal or binary data? 2016-05-30T15:41:37.033

16 PCA and exploratory Factor Analysis on the same dataset: differences and similarities; factor model vs PCA 2014-04-16T19:44:26.143

15 Factor analysis of questionnaires composed of Likert items 2010-09-04T11:15:48.317

15 Methods to compute factor scores, and what is the "score coefficient" matrix in PCA or factor analysis? 2014-12-06T10:41:21.270

13 Interpreting discrepancies between R and SPSS with exploratory factor analysis 2012-03-16T22:47:30.823

13 How does "Fundamental Theorem of Factor Analysis" apply to PCA, or how are PCA loadings defined? 2014-11-27T09:27:25.140

12 What is the precise definition of a "Heywood Case"? 2010-10-30T21:31:17.513

12 Creating a single index from several principal components or factors retained from PCA/FA 2015-01-15T02:06:38.527

11 Factor scores from discrete, ordinal responses 2010-12-15T04:04:07.567

11 Data reduction technique to identify types of countries 2011-06-11T17:37:52.547

11 Can I use PCA to do variable selection for cluster analysis? 2011-10-13T20:29:18.337

11 Looking for a step through an example of a factor analysis on dichotomous data (binary variables) using R 2012-07-09T17:36:46.780

11 Difference between exploratory and confirmatory factor analysis in determining construct independence 2012-07-22T03:42:03.283

11 Sum of rating scores vs estimated factor scores? 2016-01-18T18:32:32.347

10 How to make a matrix positive definite? 2011-03-15T19:27:04.463

10 Recommended procedure for factor analysis on dichotomous data with R 2011-05-30T15:49:10.737

10 What do the first $k$ factors from factor analysis maximize? 2011-06-26T02:03:15.220

10 Is there a reason to leave an exploratory factor analysis solution unrotated? 2014-01-19T18:40:37.650

10 What is the proper association measure of a variable with a PCA component (on a biplot / loading plot)? 2014-10-12T07:36:23.877

9 On the use of oblique rotation after PCA 2010-09-16T19:28:10.130

9 Fast computation/estimation of a low-rank linear system 2011-06-23T12:58:19.580

9 How to reduce number of items using factor analysis, internal consistency, and item response theory in conjunction? 2012-07-17T18:39:37.230

9 Can I use optimally scaled variables for a factor analysis to account for rotation? If I can then how? 2012-08-30T09:26:42.330

9 What are the assumptions of factor analysis? 2012-11-10T16:44:20.953

9 Dynamic factor analysis vs state space model 2013-06-04T02:11:04.450

9 Steps done in factor analysis compared to steps done in PCA 2014-06-10T19:15:07.613

9 Is it always better to extract more factors when they exist? 2015-10-08T17:27:33.390

9 What are dangers of calculating Pearson correlations (instead of tetrachoric ones) for binary variables in factor analysis? 2015-12-10T03:13:27.110

8 Factor analysis of dyadic data 2010-09-23T07:58:18.980

8 What to do following poor fit statistics for a confirmatory factor analysis? 2011-03-02T10:01:07.933

8 Understanding factor analysis 2012-02-08T18:33:09.387

8 Dynamic factor analysis vs factor analysis on differences 2012-05-24T12:12:07.357

8 Does using box-cox transformation on individual data sets prevent these data from being comparable? 2012-06-21T14:11:38.843

8 Based on factor loadings (in factor analysis) can we give unequal weights to Likert scale items? 2012-07-09T21:51:53.930

8 Dimension reduction techniques for very small sample sizes 2012-07-26T09:25:05.130

8 Are data transformations on non-normal data necessary for an exploratory factor analysis when using the principal axis factoring extraction method? 2012-08-21T02:53:55.587

8 Is it acceptable to have only two (or less) items (variables) loaded by a factor in factor analysis? 2012-11-26T15:47:15.160

8 How to correctly interpret a parallel analysis in exploratory factor analysis? 2014-05-15T07:07:35.170

8 What is the relationship between scale reliability measures (Cronbach's alpha etc.) and component/factor loadings? 2014-06-17T15:58:27.003

8 Factor rotation methods (varimax, oblimin, etc.) - what do the names mean and what do the methods do? 2015-12-05T20:04:44.117

7 FA: Choosing Rotation matrix, based on "Simple Structure Criteria" 2010-08-18T07:36:59.733

7 Papers on Bayesian factor analysis? 2010-09-02T02:00:45.543

7 Differences between tetrachoric and Pearson correlation 2010-09-26T13:40:48.663

7 Validating an existing questionnaire into another language 2011-02-11T15:52:57.197

7 Should factor loadings be dominated by items' ranges of answer options? 2011-05-18T16:20:16.897

7 How to reduce question set of a poorly designed questionnaire? 2011-10-09T21:29:48.637

7 Advice on scientifically sound scale construction 2012-01-15T16:39:00.600

7 Whether to use original or reverse coded items in factor analysis? 2012-08-10T02:44:44.680

7 Skewed variables in PCA or factor analysis 2012-10-05T05:39:35.647

7 Factor analysis on multiply imputed data 2012-12-26T21:25:32.333

7 Dimensionality Reduction Algorithm for Large Dataset? 2013-04-11T00:11:55.040

7 EFA clearly supports one-factor, measure is internally consistent, but CFA has poor fit? 2013-04-13T19:35:52.070

7 Why set weights to 1 in confirmatory factor analysis? 2013-05-14T15:42:18.303

7 Good, authoritative recent book on factor analysis and principal component analysis 2013-12-21T23:55:49.987

7 How to do factor analysis when the covariance matrix is not positive definite? 2015-04-07T21:32:45.143

7 Very different results of principal component analysis in SPSS and Stata after rotation 2015-05-27T23:01:27.870

7 Which matrix should be interpreted in factor analysis: pattern matrix or structure matrix? 2015-08-12T10:34:18.773

6 Factor Significance for Factor Model 2010-10-22T15:41:29.937

6 How can one extract meaningful factors from a sparse matrix? 2010-11-20T07:22:34.117

6 How to use variables derived from factor analysis as predictors in logistic regression? 2011-02-22T03:24:55.477

6 Whether to use EFA or PCA to assess dimensionality of a set of Likert items 2011-06-08T12:57:46.427

6 Factor analysis on mixed (continuous/ordinal/nominal) data? 2011-06-14T13:23:48.300

6 How to analyse a ranking and rating scale together? 2012-05-03T16:58:10.723

6 How to conduct a factor analysis on questionnaire data based on 30 items in three blocks? 2012-05-13T20:04:12.687

6 When is it incorrect to compute factor scores by summing (or averaging) raw variable scores? 2013-05-13T14:47:13.643

6 Performing "all-possible regressions" in R 2013-08-23T16:11:02.377

6 What is a "factor" in factor analysis? 2013-09-29T13:16:03.130

6 Factor analysis on a "rotating" subset of survey questions 2014-01-04T02:41:18.193

6 Permutation test for factor analysis 2014-02-07T00:04:41.067

6 The difference between varimax and oblimin rotations in factor analysis 2014-08-23T18:16:02.137

6 What is the meaning of the R factanal output? 2014-10-24T04:25:36.270

6 Under which conditions do PCA and FA yield similar results? 2014-12-04T04:38:17.317

6 Cluster analysis vs Factor analysis as a means for "grouping" variables or cases: the differences 2016-05-19T00:32:19.920

6 In Factor Analysis (or in PCA), what does it mean a factor loading greater than 1? 2017-03-09T00:45:57.477

5 Factor analysis problem -- singular covariance matrix? 2011-05-22T03:56:56.093

5 Difference between loadings and correlations between observed variables and factor saved scores in factor analysis 2011-07-08T02:30:05.750

5 Can I delete excessive number of multivariate outliers, like over 10% in sample? 2011-09-04T04:20:03.317

5 How to calculate an overall job satisfaction score and test group differences? 2011-09-19T16:14:57.813

5 Whether to leave the data unaltered in the face of outliers and non-normality when performing structural equation modelling? 2011-12-21T04:59:30.427

5 Can I somehow compute variance explained by PC after Oblique rotation in PCA? 2012-02-14T21:16:52.883

5 Summarization of correlated but noisy measurement data 2012-06-20T21:03:50.933

5 Exploratory factor analysis among items with different measurements 2012-08-07T17:09:53.220

5 When is appropriate to run a factor analysis at items level vs. scale level in a questionnaire? 2012-09-16T16:43:41.240

5 What's the difference between a component and a factor in parallel analysis? 2013-03-14T17:50:27.337

5 MuthÃ©n's robust weighted least squares factoring method for binary items...in R? 2013-04-03T19:00:47.380

5 What to do with a variable that loads equally on two factors in a factor analysis? 2013-05-12T01:35:05.157

5 Finding latent variables in 7 dichotomous variables 2013-06-07T11:12:27.833

5 Should control variables be included in model if statistically insignificant? 2013-09-06T13:51:22.027

5 Why do PCA and Factor Analysis return different results in this example? 2013-11-14T05:46:04.140