The observed values will be either equal to the counts or missing. The probability of missing is the inverse of the counts + 1.
1 2  | missingAtRandom(dataset, proportion = 0.25, count.variable = "Count",
  observed.variable = "Observed")
 | 
dataset | 
 A dataset to a the observation with missing data  | 
proportion | 
 The proportion of observations that will be missing  | 
count.variable | 
 The name of the variable holding the counts  | 
observed.variable | 
 The name of the variable holding the observed values = either count or missing  | 
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