ped
is a matrix of 10 columns:
ped[,1]
family ID,
ped[,2]
subject ID,
ped[,3]
father ID, 0 for founders (i.e. subjects having no parents in the pedigree),
ped[,4]
mother ID, 0 for founders (i.e. subjects having no parents in the pedigree),
ped[,5]
subject sex: 1 male, 2 female,
ped[,6]
symptom status (2: symptomatic, 1: without symptoms, 0: missing),
ped[,7:10]
continuous observations, NA
for
missing and without symptoms,