Displaying 2 results from an estimated 2 matches for "pesta".
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esta
2011 Jul 20
0
Analysis of unbalanced data in nlme or car
...another study, I am investigating the interactions between pesticides
in a two-way design: (pesticideA x no pesticide A) crossed with
(pesticideB x no pesticide B). The blocks and number of replicates is as
above, and the data are unbalanced again. The model is defined as
model<-lme(growth.rate~pestA*pestB,random=~1|block). When I run
intervals (model), I usually get the following error message: "Error in
intervals.lme(model) : Cannot get confidence intervals on var-cov
components: Non-positive definite approximate variance-covariance". I
have read on the mailing list that the error m...
2011 Jul 25
2
Wide confidence intervals or Error message in a mixed effects model (nlme)
...random factor?
In another study, I am investigating the interactions between pesticides
in a two-way design: (pesticideA x no pesticide A) crossed with
(pesticideB x no pesticide B). The blocking is as above, and the data
are unbalanced again. The model is defined as
model<-lme(growth.rate~pestA*pestB,random=~1|block). When I run
intervals (model), I usually get the following error message: "Error in
intervals.lme(model) : Cannot get confidence intervals on var-cov
components: Non-positive definite approximate variance-covariance". I
have read on the mailing list that the error m...