calculate moments (mean, variance) for simulated ibd vectors for an individual predigree from sim.mark.prop
ibd.moments(simped, person.indx, male, x.linked=FALSE)
a list with person1.id person2.id sm and sv
The object returned from sim.mark.prop
person identifier
binary code (1/0) for if person is male
logical, if TRUE, apply the method for an x-linked chromosome
sim.mark.prop