lme4 - error message when performing Gamma glmer in R- PIRLS step-halvings failed to reduce deviance in pwrssUpdate -


i trying perform glmer in r using gamma error family. error message: "error: (maxstephalfit) pirls step-halvings failed reduce deviance in pwrssupdate"

my response variable flower mass. fixed effects base mass, f1 treatment, , fertilisation method. random effects line , maternal id nested within line.

when perform same analysis using integer response (ie. flower number) error not occur.

here sample of data:

line maternal_id  f1treat    flwr_mass  base_mass 17   81           stress   s    2.7514     9.488 5    41           control  o    0.3042     1.809 37   89           control  o    2.3749     6.694 5    41           stress   s    3.6140     9.729 9    5            control  s    0.5020     7.929 13   7            stress   s    0.4914     0.969 35   88           stress   s    0.4418     1.840 1    57           control  o    2.1531     6.673 13   7            stress   s    3.0191     7.131

here code using:

library(lme4) m <- glmer(data=mydata,            flwr_mass~base_mass*f1treat*so+(1 |line/maternal_id),family=gamma)

(i using r 3.0.3 windows)

@hongooi answered question in comments, repeat here else having issue. suggested changing

family=gamma

to

family=gamma(link=log)

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