A matrix of dimension length(xgrid)xlength(ygrid) of values of the variance.
Details
Due to the form of the asymptotic variance for equal binomial sizes, this does not need a specification of the binomial size
binsize (see asymean).
References
Fisz, M. (1955), The Limiting Distribution of a Function of Two Independent Random Variables and its Statistical
Application, Colloquium Mathematicum, 3, 138--146.
# NOT RUN {variance<-asyvar(xgrid=seq(0,1,length=21),ygrid=seq(0,1,length=21))
## this produces a 21x21 matrix for an equally-spaced grid of binomial proportions. # }