R help - May 2012 - lme or lmer for unbalance data

Dear community, 

I'd like to fix a mixed model. I have unbalance data, what should i use: 
lme in nlme package , or lmer in lme4.

Thanks, user at host.com as user at host.com

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agent dunham <crosspide <at> hotmail.com> writes:
> I'd like to fix a mixed model. I have unbalance data, what should i
use:
> lme in nlme package , or lmer in lme4.
> 
> Thanks, user <at> host.com as user <at> host.com
> 
  More advanced mixed model questions belong on r-sig-mixed-models <at>
r-project.org , but the answer to this one is: either should be fine,
unless you want one of the features that only lme has (reported denominator
df/p values, R-side effects such as correlation and heteroscedasticity 
models) or one of the features that only lmer has (efficient fitting of
crossed random effects, GLMMs).

  Ben Bolker