Displaying 4 results from an estimated 4 matches for "wzep".
Did you mean:
wep
2011 Aug 17
0
vglm regression with weibull distribution
...y to apply solution provide in help of the package that consisted to use lschape="logoff" and eschape=list(offset=-2)
regWeib0<-vglm(eqn0,family=weibull(lshape='logoff',eshape=list(offset=-2)),subset(br, fdh<1))
Erreur dans if ((temp <- sum(wz[, 1:M, drop = FALSE] < wzepsilon))) warning(paste(temp,? :
? l'argument n'est pas interpr?table comme une valeur logique
De plus : Message d'avis :
In log(theta + offset) : production de NaN
Finaly i use the above function to find initial value for shape (a) and scale (b)?
weibullPar<-function(x){
?f<-fu...
2007 Jan 06
2
Using VGAM's vglm function for ordinal logistic regression
...ntercept):1 (Intercept):2 log(exposure.time)
-1.6306499 2.5630170 -0.1937956
Degrees of Freedom: 48 Total; 45 Residual
Residual Deviance: 503.7251
Log-likelihood: -251.8626
Warning messages:
1: 4 elements replaced by 1.819e-12 in: checkwz(wz, M = M, trace =
trace, wzeps = control$wzepsilon)
2: 4 elements replaced by 1.819e-12 in: checkwz(wz, M = M, trace =
trace, wzeps = control$wzepsilon)
3: 4 elements replaced by 1.819e-12 in: checkwz(wz, M = M, trace =
trace, wzeps = control$wzepsilon)
4: 4 elements replaced by 1.819e-12 in: checkwz(wz, M = M, trace =
trace...
2007 Jul 16
2
Error while fitting Partial Proportional Odds model using vglm
...number of items to replace is not a multiple of replacement length
In addition: Warning messages:
1: NaNs produced in: log(x)
2: fitted values close to 0 or 1 in: tfun(mu = mu, y = y, w = w, res =
FALSE, eta = eta, extra)
3: 19 elements replaced by 1.819e-12 in: checkwz(wz, M = M, trace = trace,
wzeps = control$wzepsilon)
Ironically, it works ok with Proportional Odds (change parallel = T above),
but fails with PPO (parallel = F).
I will appreciate any help to fix this problem.
Thanks
Rizwan Younis
Grad Student
University of Waterloo
Waterloo, ON Canada
2008 Oct 10
0
Problems and bugs in vgam()
...I frequently run into the error below. Any advice on how to overcome it?
Applying Greenstadt modification to 357 matrices
Error in ans[, index] <- tmp777 :
number of items to replace is not a multiple of replacement length
In addition: Warning message:
In checkwz(wz, M = M, trace = trace, wzeps = control$wzepsilon) :
357 elements replaced by 1.819e-12
In case someone has the interest or time in helping me get models to
converge, I provide an example model and data. (Data are attached and
the model code is below.) Thanks for your help.
library(VGAM)
Cnictdat=read.csv("Cnictd...