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ttnphns

Moscow, Russia

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A SPSS user/developer, data analyst.

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Top Questions
Top Answers
27
Why does the correlation coefficient between X and X-Y random variables tend to be 0.7
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26
What's the difference between principal components analysis and multidimensional scaling?
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19
How does centering the data get rid of the intercept?
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18
What is the role of MDS in modern statistics?
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16
If mean is so sensitive, why use it in the first place?
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16
Is there an intuitive interpretation of $A^TA$?
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15
Should one remove highly correlated variables before doing PCA?
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11
When to use the Wilcoxon rank-sum test instead of the unpaired t-test?
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11
What is the difference between R functions prcomp and princomp?
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11
Strange pattern of residuals
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9
PCA and proportion of variance explained
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8
Understanding repeated measure ANOVA assumptions for correct interpretation of SPSS output
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8
Measuring entropy/ information/ patterns of a 2d binary matrix
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8
Are mean normalization and feature scaling needed for k-means clustering?
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7
Differences between MANOVA and Repeated Measures ANOVA?
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7
How does linear discriminant analysis reduce the dimensions?
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7
PCA when the dimensionality is greater than the number of samples
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7
Analyzing Likert scales
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6
Will the silhouette formula change depending on the distance metric?
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6
Zero regression coefficient when correlations are not zero
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6
How to compare two or more correlation matrices?
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6
Question about independence assumption for ANOVA, t-test, and non-parametric tests
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6
How does the Goodman-Kruskal gamma test and the Kendall tau or Spearman rho test compare?
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6
Tests of independence in contingency tables
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6
How can 8 dimensions be reduced to 3?
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6
What is the difference between “coefficient of determination” and “mean squared error”?
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6
PCs scores from Correlation and Covariance matrices through matrix computations and prcomp
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5
Why do people often run a regression with and without control variables?
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5
Dimensionality reduction technique to maximize separation of known clusters?
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5
How to perform principal components analysis on binary (Yes/No) data using SPSS?
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