hi

i try to find regression between clupeidae,with temperature,salinity and
depth. the response variable is inclued many zero ( 86 from 133 observed)

therefore i used this code :

 res <- cozigam(Clupeidae~s(temperature,salinity)+s(depth), constraint =
"proportional", family = gaussian)


the result:


iteration = 2    norm = 1.001743

iteration = 3    norm = 0.3377464

iteration = 4    norm = 9.172232e-05



==========================================

estimated alpha = -0.5337883 ( 0.1789113 )

estimated delta = -0.0009891505 ( NaN )

==========================================



Warning message:

In sqrt(V.theta[2, 2]) : NaNs produced


what is exactly meaning?


thanks for your help

-- 
Mahnaz

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