#calculate the standardized residuals
standard_res <- rstandard(model)
#view the standardized residuals
standard_res
1 2 3 4 5 6
1.40517322 0.81017562 0.07491009 -0.59323342 -1.24820530 -0.64248883
7 8 9 10 11 12
0.59610905 -0.05876884 -2.11711982 -0.06655600 0.91057211 1.26973888