equalTheta {dirmult}

Test whether theta is equal for several tables

Description

Estimates parameters \pi for each table under the contraint that \theta is equal for all tables.

Usage

equalTheta(data, theta, epsilon=10^(-4), trace=TRUE, initPi, maxit=1000)

Arguments

data

A list of matrix or table with counts. Rows in the tables represent subpopulations and columns the different categories of the data. Zero columns are automaticly removed.

theta

Initial value of the commen theta paramter.

epsilon

Tolerance of the convergence, see dirmult.

trace

Logical. TRUE: print estimates while iterating.

initPi

Initial values for each pi vector (one of each table).

maxit

Maximum number of iterations.

Value

Returns a list similar to the output of dirmult.

See Also

dirmult

Examples

## Not run: data(us)
fit <- lapply(us[1:2],dirmult,epsilon=10^(-12),trace=FALSE)
thetas <- unlist(lapply(fit,function(x) x$theta))
logliks <- unlist(lapply(fit,function(x) x$loglik))
fit1 <- equalTheta(us[c(1:2)],theta=mean(thetas),epsilon=10^(-12))
lr <- -2*(fit1$loglik-sum(logliks))
1-pchisq(lr,df=1)
fit1$theta[[1]]

## End(Not run)