[R] Not missing at random

[Blaz Simcic]

Hello!
 
I would like to sample 30 % of cases (with at least 1 value lower than 3 - in 
the row) and among them I want to set all values lower than 3 (within selected 
cases) as NA (NMAR- Not missing at random). I managed to sample cases, but I 
don’t know how to set values (lower than 3) as NA.
 
R code:
 
x <- 
matrix(c(1,2,3,4,5,1,2,3,4,5,1,2,3,4,5,1,2,3,4,5,1,2,3,4,5,1,2,3,4,5,1,2,3,4,5,1,2,3,4,5,1,2,3,4,5,3,3,3,4),
 nrow = 7, ncol=7, byrow=TRUE) ####matrix
 
pMiss <- 30     ####percent of missing values
 
N <- dim(x)[1]   ####number of cases
 
candidate<-which(x[,1]<3 | x[,2]<3 | x[,3]<3 | x[,4]<3 | x[,5]<3 | x[,6]<3 | 
x[,7]<3)    #### I want to sample all cases with at least 1 value lower than 
3, 
so I have to find candidates
 
idMiss <- sample(candidate, N * p / 100)    #### I sampled cases
 
Now I'd like to set all values among sampled cases as NA.
 
Any suggestion?
 
Thanks,
Blaž
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