VGAM (version 0.8-1)

AB.Ab.aB.ab: The AB-Ab-aB-ab Blood Group System

Description

Estimates the parameter of the AB-Ab-aB-ab blood group system.

Usage

AB.Ab.aB.ab(link = "logit", earg=list(), init.p = NULL)

Arguments

link

Link function applied to p. See Links for more choices.

earg

List. Extra argument for the link. See earg in Links for general information.

init.p

Optional initial value for p.

Value

• An object of class "vglmff" (see vglmff-class). The object is used by modelling functions such as vglm and vgam.

Details

This one parameter model involves a probability called p.

References

Lange, K. (2002) Mathematical and Statistical Methods for Genetic Analysis, 2nd ed. New York: Springer-Verlag.

See Also

AA.Aa.aa, AB.Ab.aB.ab2, ABO, G1G2G3, MNSs.

Examples

y = cbind(AB=1997, Ab=906, aB=904, ab=32) # Data from Fisher (1925)
fit = vglm(y ~ 1, AB.Ab.aB.ab(link="identity", init.p=0.9), trace=TRUE)
fit = vglm(y ~ 1, AB.Ab.aB.ab, trace=TRUE)
rbind(y, sum(y)*fitted(fit))
Coef(fit) # Estimated p
p = sqrt(4*(fitted(fit)[,4]))
p*p
summary(fit)