Fitting random intercept and slope in lmer for lme4.

Question

If I would like to fit random intercept and slope and if I write it as (color|writer) compared to (1+color|writer), are they the same?

score 3 · Accepted Answer · answered Mar 20 '14 at 17:37

3

Yes, (1+color|writer) and (color|writer) are the same. The intercept is always assumed, unless it is explicitly suppressed, e.g. via (0+color|writer), where only the slope is random.

answered Mar 20 '14 at 17:37

Patrick Coulombe

2,810

thank you very much for your reply. You've saved my life. – user3288202 Mar 20 '14 at 18:07
see also http://glmm.wikidot.com/faq#modelspec – Ben Bolker Mar 20 '14 at 20:54

Fitting random intercept and slope in lmer for lme4.

1 Answers1