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 3 | missingVolunteer(dataset, proportion = 0.25, count.variable = "Count",
  observed.variable = "Observed", year.variable = "Year",
  site.variable = "Site", max.count = 100)
 | 
| 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 | 
| year.variable | The name of the variable holding the year | 
| site.variable | The name of the variable holding the site | 
| max.count | The maximum count | 
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