[R-sig-eco] Continuous distribution for zero or positive values (in GLM or GLMM)
fredtaka at gmail.com
Wed May 18 17:46:33 CEST 2011
Hello, just a basic question: what distribution I should use to
analyze continuous data which can had zero or positive values (eg.
mass of grasses in plots assuming that zero mass is meaningful)? My
expected analysis is in the framework of GLM or GLMM (or
alternatively, GAM / GAMM).
One idea I had is to add 0.0001 to all values and use family=Gamma.
That is a good approach?
If a better choice is to use a different distribution, suggestions of
packages to do that are welcome.
Universidade de Brasília - Brasil
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