Displaying 4 results from an estimated 4 matches for "gam3".
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2012 Dec 07
1
Negative Binomial GAMM - theta values and convergence
Hi there,
My question is about the 'theta' parameter in specification of a NB GAMM.
I have fit a GAM with an optimum structure of:
SB.gam4<-gam(count~offset(vol_offset)+
s(Depth_m, by=StnF, bs="cs")+StageF*RegionF,
family=negbin(1, link=log),
data=Zoop_2011[Zoop_2011$SpeciesF=='SB',])
However, this GAM shows heterogeneity in the
2010 Oct 25
1
structural equation modeling in sem, error, The model has negative degrees of freedom = -3, and The model is almost surely misspecified...
...mean_EVI", "density",
"ALL_Jack1")
I then construct a model using a symbolic ram specification as follows
>tmodel <- specify.model()
>dec_mean_EVI -> density, gam1, NA
>density -> ALL_Jack1, gam2, NA
>dec_mean_EVI -> ALL_Jack1, gam3, NA
>dec_mean_EVI <-> dec_mean_EVI, ps1, NA
>density <-> density, ps2, NA
>ALL_Jack1 <-> ALL_Jack1, theta1, NA
>dec_mean_EVI <-> density, theta2, NA
>dec_mean_EVI <-> ALL_Jack1, theta2, NA
>density <-> ALL_Jack1, theta3, NA
I then...
2007 Jun 27
1
SEM model fit
...-> oiphys, NA, 1
sev <-> sev, psi6, 0.5
aophys <-> aophys, theta13, 0.5
mvphys <-> mvphys, theta14, 0.5
oiphys <-> oiphys, theta14, 0.5
con -> sev, gam3, 0.8
prev -> mvpct, NA, 1
prev -> oipct, NA, 1
prev -> alcpct, NA, 1
prev <-> prev, psi8, 0.4
mvpct <-> mvpct, theta15, 0.5
oipct...
2012 Mar 23
0
Fixing error variance in a path analysis to model measurement error in scales using sem package
...What follows is the following path analysis model in theory (i.e., in
practice the formulas are replaced with actual numbers):
path.inf.final <- specifyModel()
pRU -> sRU, test1
pRU -> rRU, test2
sRU -> rRU, test3
sRU -> power_alt, gam1
pRU -> power_alt, gam2
rRU -> power_alt, gam3
sRU -> ms_alt, gam7
pRU -> ms_alt, gam8
rRU -> ms_alt, gam9
sRU <-> sRU, NA, (1 - alpha(sRU))*(variance(sRU))
pRU <-> pRU, NA, (1 - alpha(pRU))*(variance(pRU))
rRU <-> rRU, NA, (1 - alpha(rRU))*(variance(rRU))
power_alt -> em, iota1
power_alt <-> power_alt, NA,...