VGAM (version 0.9-4)

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", init.p = NULL)

Arguments

link

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

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

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