Error in r for gls on corAR1-not unique -

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does know how solve problem error:

library(nlme) gls(number.of.fish~julian.date+temperature+size.class,na.action=na.omit,data=mydata,correlation=corar1(form=~julian.date))  error in initialize.corar1(x[[1l]], ...) :    covariate must have unique values within groups "corar1" objects

you have 2 or more samples taken on same julian.date , can't have in corar1() corstruct() object.

how solve depend upon sampling design. these values 2 different sites? if site should in corar1():

corar1(form ~ julian.date | site)

beyond that, struggling envision equally-spaced observations in time 2 sample occurring on same day.

if response count, might want think again using gls(), using model discrete count data instead.


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