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ei.reg <- function(formula, data, ...) {
D <- model.frame(formula, data = data)
G <- D[[2]]
T <- D[[1]]
idx.r <- apply(G,1,sum)
idx.c <- apply(T,1,sum)
countG <- countT <- propG <- propT <- FALSE
if(all(as.integer(T)==T) && all(T)>=0){
countT <- TRUE
}
else{
propT <- TRUE
}
if(all(as.integer(G)==G) & all(G)>=0){
countG <- TRUE
}
else{propG <- TRUE}
if(countT & countG){
if(all(idx.r == idx.c)){
G <- G/idx.r
T <- T/idx.c
countT <- countG <- FALSE
propT <- propG <- TRUE
}
else{
stop("row and column count totals unequal in some precincts -
please respecify data")
}
}
if(countT & propG){
if(!all(0 <= G && G <= 1)){
stop("row proportions are not within [0,1] - please respecify
data")
}
else{
T <- T/idx.c
propT <- TRUE
countT <- FALSE
}
}
if(propT & countG){
if(!all(0 <= T && T <= 1)){
stop("column proportions are not within [0,1] - please respecify
data")
}
else{
G <- G/idx.r
propG <- TRUE
countG <- FALSE
}
}
if(propT & propG){
idx.r <- apply(G,1,sum)
idx.c <- apply(T,1,sum)
if(!all(round(idx.r, digits=3)==1)){
stop("row marginals are proportions that do not sum to 1 - please
respecify data")
}
if(!all(round(idx.c, digits=3)==1)){
stop("column marginals are proportions that do not sum to 1 -
please respecify data")
}
}
out <- list()
se <- list()
cov.out <- list()
for (i in 1:(ncol(T))) {
lm.out <- lm(T[,i] ~ G - 1, ...)
out[[colnames(T)[i]]] <- lm.out$coef
se[[colnames(T)[i]]] <- summary(lm.out)$coef[,2]
cov.out[[colnames(T)[i]]] <- summary(lm.out)$sigma *
summary(lm.out)$cov.unscaled
colnames(cov.out[[colnames(T)[i]]]) <- colnames(G)
rownames(cov.out[[colnames(T)[i]]]) <- colnames(G)
}
tab <- cbind(out[[1]], out[[2]])
se.tab <- cbind(se[[1]], se[[2]])
if (length(out)>2){
for(i in 3:length(out)){
tab <- cbind(tab,out[[i]])
se.tab <- cbind(se.tab,se[[i]])
}
}
colnames(tab) <- colnames(se.tab) <- colnames(T)
rownames(tab) <- rownames(se.tab) <- colnames(G)
out <- list(call=match.call(), coefficients=tab, se=se.tab,
cov.matrices=cov.out)
class(out) <- "eiReg"
out
}
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