[R] glm: mustart, different default for quasi and quasipoisson

[Ulrich Halekoh]

Hallo,

for the
quasipoisson family the default for mustart is
y+ 0.1,
for the quasi family with 'variance="mu"'
the default is  y + 0.1 * (y == 0)

I would like to know, whether 
the setting for quasipoisson
is preferable for count data in relation to the quasi setting.


regards

Ulrich

Ulrich Halekoh,  PhD, Biometry Research Unit                       
Danish Institute of Agricultural Sciences    
Research Centre Foulum, DK-8830 Tjele, Denmark



         _              
platform i386-pc-mingw32
arch     i386           
os       mingw32        
system   i386, mingw32  
status                  
major    2              
minor    0.1            
year     2004           
month    11             
day      15             
language R