Introduce 3 types of missing values altogether using produce_na()

[redfish9]

To Introduce 3 types of missing values altogether using produce_na(), the possible solution I came up with is calling this func 3 times and parsing 'MCAR', 'MAR' and 'MNAR' in a row.

Therefore, I wonder whether the final missing rate will be the sum of the three (e.g., 0.2 + 0.2 + 0.2 = 0.6) ?

Also, is there any better approach you may generously offer? Really appreaciate it.