The Comprehensive Guide notes that invalid moments do not affect the response rate either way. Invalid responses do not count towards or against the 85% response rate because they are removed from the results. Page 122 of the Comprehensive Guide states that moments received during unpaid time off are considered invalid responses. Employees on unpaid time off or who have left their positions and have not been replaced should be removed from the sample to avoid distorting the time study results. As these moments are considered invalid, it is correct that they should be excluded from both the numerator and denominator of the 85% RMTS response rate calculation.
Total Valid Moments (excludes invalid moments)/
Total Valid Sampled Moments + Total Nonresponses (excludes invalid moments)