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Table 14 Calculation of Response Rate

From: Teaching evolution in U.S. public schools: a continuing challenge

 Number
Total mailed5014
Total useable surveys (complete + partial)1499
Confirmed/assumed eligible among non-returned (codes 21 + 32)423
Confirmed ineligible (41 + 42)171
Total non-response of unknown eligibility (22 + 23 + 31 + 33)2920
“e”—Estimated % eligible among non-returns of unknown eligibility*73.0%
Estimated eligible (e x (22 + 23 + 31 + 33)) + (21 + 32)2555
RR4 (completes + partials)/(completes + partials + estimated eligible)37.0%