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Thomas Bilach
  • Member for 3 years, 3 months
  • Last seen this week
  • New York City, NY, USA
389 votes
9 answers
765k views

What is the difference between fixed effect, random effect and mixed effect models?

  • 5,668
283 votes
15 answers
532k views

What is the meaning of p values and t values in statistical tests?

  • 4,196
269 votes
10 answers
154k views

How would you explain covariance to someone who understands only the mean?

  • 13.7k
224 votes
4 answers
418k views

How to interpret a QQ plot

  • 18.7k
207 votes
8 answers
464k views

In linear regression, when is it appropriate to use the log of an independent variable instead of the actual values?

  • 2,221
158 votes
3 answers
185k views

How are the standard errors of coefficients calculated in a regression?

  • 1,683
115 votes
21 answers
43k views

What's a real-world example of "overfitting"?

87 votes
14 answers
66k views

What is the meaning of "All models are wrong, but some are useful"

  • 1,083
78 votes
7 answers
10k views

Do not vote, one vote will not reverse election results. What is wrong with this reasoning?

76 votes
6 answers
107k views

Why is it that natural log changes are percentage changes? What is about logs that makes this so?

74 votes
15 answers
11k views

Why would parametric statistics ever be preferred over nonparametric?

  • 907
68 votes
2 answers
23k views

Is there a difference between 'controlling for' and 'ignoring' other variables in multiple regression?

66 votes
4 answers
69k views

Does it make sense to add a quadratic term but not the linear term to a model?

  • 13.4k
36 votes
1 answer
4k views

How exactly is the "effectiveness" in the Moderna and Pfizer vaccine trials estimated?

30 votes
10 answers
3k views

What are the myths associated with linear regression, data transformations?

29 votes
3 answers
17k views

What does "all else equal" mean in multiple regression?

  • 835
28 votes
7 answers
60k views

Why is gender typically coded 0/1 rather than 1/2, for example?

  • 3,055
24 votes
3 answers
21k views

t-test on highly skewed data

  • 585
23 votes
2 answers
3k views

R-squared is equal to 81% means what?

  • 635
21 votes
5 answers
6k views

When are Bayesian methods preferable to Frequentist?

  • 1,136
19 votes
3 answers
12k views

Utility of the Frisch-Waugh theorem

18 votes
4 answers
102k views

Split data into N equal groups

18 votes
5 answers
16k views

Fixed effect vs random effect when all possibilities are included in a mixed effects model

18 votes
7 answers
5k views

Why do we worry about overfitting even if "all models are wrong"?

  • 361
16 votes
2 answers
14k views

P-values equal to 0 in permutation test

16 votes
1 answer
12k views

When is it necessary to include the lag of the dependent variable in a regression model and which lag?

15 votes
3 answers
23k views

Difference-in-differences with individual level panel data

  • 208
15 votes
3 answers
996 views

Which OLS assumptions are colliders violating?

15 votes
7 answers
2k views

Why the p-value of t.test() is not statistically significant when mean values look really different

  • 841
15 votes
2 answers
2k views

Significance test for two groups with dichotomous variable

  • 253