Skip to main content
Robert Long's user avatar
Robert Long's user avatar
Robert Long's user avatar
Robert Long
  • Member for 12 years, 7 months
  • Last seen this week
21 votes
1 answer
11k views

Standard error of random effects in R (lme4) vs Stata (xtmixed)

12 votes
1 answer
46k views

"the leading minor of order 1 is not positive definite" error using 2l.norm in mice

11 votes
1 answer
2k views

Imputation of a censored variable

9 votes
2 answers
2k views

Diagnosing why MICE is crashing R when attempting to impute multilevel data

9 votes
1 answer
200 views

Under what conditions does it make sense to fit random intercepts for an interaction, but not the main effects?

8 votes
2 answers
166 views

Origin of the term "spherical" in relation to covariance matrices?

8 votes
0 answers
75 views

Any Insights on the adoption and use of the Healthy Akaike Information Criterion (hAIC)?

7 votes
1 answer
2k views

Point-Biserial Correlation vs Pearson's Correlation

7 votes
1 answer
1k views

Understanding Simpson's paradox with random effects

7 votes
0 answers
108 views

Choosing the number of hidden layers and nodes in a Deep Belief Network

7 votes
1 answer
246 views

Sampling distribution of random effects estimator

6 votes
1 answer
2k views

Why does MICE fail to impute multilevel data with 2l.norm and 2l.pan?

6 votes
3 answers
1k views

Looking for book recommendations for numerical optimization

6 votes
2 answers
329 views

Frank Harrell's interpretation of interaction in regression results

5 votes
1 answer
373 views

How can I construct the random effects model matrix from a mixed model formula

5 votes
2 answers
1k views

Multiple Imputation for Mixed Effects models

5 votes
1 answer
1k views

Imputation for a zero-inflated negative binomial mixed effects model

4 votes
1 answer
511 views

Pooling the results of random hot-deck imputation

4 votes
1 answer
5k views

Warning:"NAs introduced by coercion" in MICE with unique ID [closed]

3 votes
1 answer
2k views

Understanding nested random effects - why is an interaction between factors involved?

3 votes
1 answer
902 views

Testing if a proportion is different between groups

2 votes
1 answer
68 views

moderated mediation vs mediated moderation

1 vote
1 answer
665 views

Why does MICE fail for one dataset and not the other? [closed]

0 votes
1 answer
1k views

Quantile function in Stata [closed]