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bb73
2008 Nov 20
4
Fitting a sine wave using solver
Greetings,
I have several sets of oscillation data and would like to estimate the
parameters of a sine function to each set (and hopefully automate
this). A colleague provided an excel sheet that uses solver to minimize
the RSS after fitting the sine function to each data set, but this
cumbersome and difficult to automate. Is there a method in R for
fitting a given sine function to a
2008 Nov 24
1
lme4 and false convergence
Dear R-users,
I am using the most updated package of lme4 (lme4_0.999375-2). I have a
data set consisting of ~900 observations at ~440 independent survey
sites. There are an unbalanced number of surveys at each site. I am
attempting to develop several models evaluating the presence/absence of
a species (PRES) at these random sites (SITE) using a number of
predictor variables. The