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## ----echo=FALSE,eval=FALSE----------------------------------------------------
# options(width=80)
## ----results='hide',eval=FALSE------------------------------------------------
# library(catdata)
# data(birth)
# attach(birth)
## ----eval=FALSE---------------------------------------------------------------
# intensive <- rep(0,length(Intensive))
# intensive[Intensive>0] <- 1
# Intensive <- intensive
#
# previous <- Previous
# previous[previous>1] <- 2
# Previous <- previous
## ----eval=FALSE---------------------------------------------------------------
# library(gee)
## ----eval=FALSE---------------------------------------------------------------
# library(VGAM)
# Birth <- as.data.frame(na.omit(cbind(Intensive, Cesarean, Sex, Weight, Previous,
# AgeMother)))
# detach(birth)
# bivarlogit <- vglm(cbind(Intensive , Cesarean) ~ Weight + AgeMother +
# as.factor(Sex) + as.factor(Previous), binom2.or(zero=NULL), data=Birth)
# summary(bivarlogit)
## ----eval=FALSE---------------------------------------------------------------
# n <- dim(Birth)[1]
# ID <- rep(1:n,2)
#
# InterceptInt <- InterceptCes <- rep(1, 2*n)
# InterceptInt[(n+1):(2*n)] <- InterceptCes[1:n] <- 0
#
# AgeMotherInt <- AgeMotherCes <- rep(Birth$AgeMother,2)
# AgeMotherInt[(n+1):(2*n)] <- AgeMotherCes[1:n] <- 0
#
# SexInt <- SexCes <- rep(Birth$Sex,2)
# SexInt[SexInt==1] <- SexCes[SexCes==1] <- 0
# SexInt[SexInt==2] <- SexCes[SexCes==2] <- 1
# SexInt[(n+1):(2*n)] <- SexCes[1:n] <- 0
#
# PrevBase <- rep(Birth$Previous,2)
# PreviousInt1 <- PreviousCes1 <- PreviousInt2 <- PreviousCes2 <- rep(0, 2*n)
# PreviousInt1[PrevBase==1] <- PreviousCes1[PrevBase==1] <- 1
# PreviousInt2[PrevBase>=2] <- PreviousCes2[PrevBase>=2] <- 1
# PreviousInt1[(n+1):(2*n)] <- PreviousInt2[(n+1):(2*n)] <- PreviousCes1[1:n] <-
# PreviousCes2[1:n] <- 0
#
# WeightInt <- WeightCes <- rep(Birth$Weight,2)
# WeightInt[(n+1):(2*n)] <- WeightCes[1:n] <- 0
## ----eval=FALSE---------------------------------------------------------------
# GeeDat <- as.data.frame(cbind(ID, InterceptInt, InterceptCes, SexInt , SexCes ,
# WeightInt , WeightCes , PreviousInt1 , PreviousInt2, PreviousCes1,
# PreviousCes2, AgeMotherInt , AgeMotherCes, Response=
# c(Birth$Intensive, Birth$Cesarean)))
## ----eval=FALSE---------------------------------------------------------------
# gee1 <- gee (Response ~ -1 + InterceptInt + InterceptCes + WeightInt + WeightCes
# + AgeMotherInt + AgeMotherCes + SexInt + SexCes +
# PreviousInt1 + PreviousCes1 + PreviousInt2 + PreviousCes2,
# family=binomial(link=logit), id=ID, data=GeeDat)
#
# summary(gee1)
## ----eval=FALSE---------------------------------------------------------------
# coefficients(bivarlogit)[1:2]
# coefficients(gee1)[1:2]
#
# coefficients(bivarlogit)[4:5]
# coefficients(gee1)[3:4]
#
# coefficients(bivarlogit)[7:8]
# coefficients(gee1)[5:6]
#
# coefficients(bivarlogit)[10:11]
# coefficients(gee1)[7:8]
#
# coefficients(bivarlogit)[13:14]
# coefficients(gee1)[9:10]
#
# coefficients(bivarlogit)[16:17]
# coefficients(gee1)[11:12]
## ----echo=FALSE,eval=FALSE----------------------------------------------------
# detach(package:VGAM)
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