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1259 votes
27 answers
839k views

Making sense of principal component analysis, eigenvectors & eigenvalues

  • 12.9k
430 votes
5 answers
163k views

How to understand the drawbacks of K-means

  • 6,517
384 votes
7 answers
369k views

When conducting multiple regression, when should you center your predictor variables & when should you standardize them?

  • 4,251
377 votes
26 answers
135k views

Python as a statistics workbench

338 votes
8 answers
131k views

Why is Euclidean distance not a good metric in high dimensions?

  • 3,597
322 votes
13 answers
186k views

How to understand degrees of freedom?

  • 18.2k
239 votes
4 answers
109k views

ROC vs precision-and-recall curves

224 votes
4 answers
418k views

How to interpret a QQ plot

  • 18.7k
209 votes
6 answers
230k views

Can principal component analysis be applied to datasets containing a mix of continuous and categorical variables?

207 votes
3 answers
141k views

R's lmer cheat sheet

197 votes
10 answers
212k views

How to deal with perfect separation in logistic regression?

  • 6,761
182 votes
5 answers
64k views

Training on the full dataset after cross-validation?

163 votes
9 answers
106k views

Bottom to top explanation of the Mahalanobis distance?

  • 5,317
139 votes
9 answers
158k views

Why does a time series have to be stationary?

  • 1,391
138 votes
5 answers
45k views

What is the .632+ rule in bootstrapping?

132 votes
2 answers
74k views

Removal of statistically significant intercept term increases $R^2$ in linear model

  • 2,132
127 votes
9 answers
97k views

Numerical example to understand Expectation-Maximization

  • 2,483
104 votes
5 answers
51k views

Diagnostic plots for count regression

  • 3,501
103 votes
32 answers
37k views

What book would you recommend for non-statistician scientists?

103 votes
2 answers
63k views

How scared should we be about convergence warnings in lme4

  • 1,515
95 votes
4 answers
56k views

How to choose nlme or lme4 R library for mixed effects models?

  • 5,533
94 votes
6 answers
8k views

Essential data checking tests

  • 5,533
92 votes
1 answer
89k views

When to use an offset in a Poisson regression? [duplicate]

  • 5,655
90 votes
7 answers
38k views

Euclidean distance is usually not good for sparse data (and more general case)?

  • 2,539
88 votes
11 answers
210k views

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

  • 2,011
85 votes
4 answers
54k views

Can bootstrap be seen as a "cure" for the small sample size?

  • 2,650
84 votes
11 answers
70k views

What are disadvantages of using the lasso for variable selection for regression?

  • 2,108
82 votes
6 answers
29k views

Is there any good reason to use PCA instead of EFA? Also, can PCA be a substitute for factor analysis?

  • 829
82 votes
3 answers
87k views

When to use generalized estimating equations vs. mixed effects models?

  • 5,533
77 votes
10 answers
11k views

What are the major philosophical, methodological, and terminological differences between econometrics and other statistical fields?

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