User lithic

27 answers

1k votes

822k views

2k bookmarks

Making sense of principal component analysis, eigenvectors & eigenvalues

Sep 15, 2010 at 20:05

11 answers

83 votes

202k views

77 bookmarks

How to obtain the p-value (check significance) of an effect in a lme4 mixed model?

r hypothesis-testing mixed-model p-value lme4-nlme

Feb 16, 2012 at 19:02

3 answers

67 votes

5k views

61 bookmarks

References containing arguments against null hypothesis significance testing?

hypothesis-testing statistical-significance references p-value

May 8, 2011 at 16:09

4 answers

62 votes

111k views

38 bookmarks

Under what conditions should Likert scales be used as ordinal or interval data?

ordinal-data likert scales measurement

Jul 19, 2010 at 19:17

8 answers

41 votes

22k views

27 bookmarks

How to test hypothesis of no group differences?

hypothesis-testing t-test equivalence tost

Sep 24, 2010 at 5:24

2 answers

37 votes

13k views

26 bookmarks

Is there any algorithm combining classification and regression?

regression machine-learning classification predictive-models finite-mixture-model

Nov 14, 2016 at 18:42

3 answers

32 votes

48k views

47 bookmarks

How to get an "overall" p-value and effect size for a categorical factor in a mixed model (lme4)?

r hypothesis-testing anova mixed-model lme4-nlme

Apr 24, 2014 at 15:35

8 answers

29 votes

3k views

14 bookmarks

The abundance of P values in absence of a hypothesis

probability hypothesis-testing statistical-significance p-value

Mar 19, 2015 at 21:57

4 answers

28 votes

23k views

20 bookmarks

Importance of predictors in multiple regression: Partial $R^2$ vs. standardized coefficients

r regression multiple-regression regression-coefficients r-squared

Jul 11, 2013 at 10:31

3 answers

26 votes

43k views

17 bookmarks

How to describe or visualize a multiple linear regression model

regression multiple-regression data-visualization presentation

Mar 12, 2014 at 14:25

2 answers

20 votes

14k views

25 bookmarks

How to choose random- and fixed-effects structure in linear mixed models?

mixed-model repeated-measures model-selection lme4-nlme likelihood-ratio

Dec 30, 2014 at 12:57

1 answer

6 votes

4k views

2 bookmarks

How could I get a correlation value that accounts for gender?

r regression correlation linear-model partial-correlation

Sep 24, 2015 at 17:18

3 answers

4 votes

3k views

1 bookmarks

Ways to overcome small number of survey responses

sampling small-sample

Jul 25, 2011 at 10:37

1 answer

1 vote

2k views

1 bookmarks

How to compare Likert ratings for multiple methods in a usability study

statistical-significance likert

Feb 27, 2013 at 17:28

1 answer

1 vote

4k views

3 bookmarks

Adjusting daily time series data for the seasonal component

r time-series seasonality arma

Dec 4, 2015 at 17:23

0 answers

0 votes

163 views

1 bookmarks

Survey-Based Analysis, Small Sample Size, Ordinal Dependent Variable

regression stata logit ordered-logit

Mar 22, 2014 at 16:15

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