# All Questions

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### Using DIC to test which data should be used - different sample sizes

I have a glmm model $y \sim b_1 * b_2 * b_3 + random$ where $b_i$ are the fixed effects. I am using DIC to compare models and select the best fitting model. I also have some options in setting up ...
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1answer
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### Appropriate number of explanatory variables in redundancy analysis (RDA)

This question comes from a reviewer's comment on a manuscript I recently submitted. I analyzed a multivariate data set (6 response variables, 21 observations for each) using redundancy analysis (RDA) ...
0answers
44 views
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### Will Tukey multiple comparison be the same for different types of Sum Of Squares of ANOVA for an unbalanced design

I am working on Two-Way ANOVA for an unbalanced design. Will Tukey multiple comparison be the same for different types (I, II & III) of Sum Of Squares of ANOVA for an unbalanced design. I am ...
1answer
2k views
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### PCA and Correspondence analysis in their relation to Biplot

Biplot is often used to display results of principal component analysis (and of related techniques). It is a dual or overlay scatterplot showing component loadings and component scores simultaneously. ...
1answer
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### Relationship between SVD and PCA. How to use SVD to perform PCA?

Principal component analysis (PCA) is usually explained via an eigen-decomposition of the covariance matrix. However, it can also be performed via singular value decomposition (SVD) of the data matrix ...
1answer
9k views
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### Interpreting 2D correspondence analysis plots

I've been searching the internet far and wide... I have yet to find a really good overview of how to interpret 2D correspondence analysis plots. Could someone offer some advice on interpreting the ...
1answer
20 views
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### Is the Scheffé test of contrasts the “best-case” for post-hoc tests?

I am reading through Explaining Psychological Statistics, 4th Edition and am stumped after the following passage: ScheffĂ© (1953) understood that the best anyone can do when creating a complex ...