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Table 12 Calculation of Response Rate

From: Teaching evolution in U.S. public middle schools: results of the first national survey

  Number
Total mailed 5014
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%
Estimated eligible (e × (22 + 23 + 31 + 33)) + (21 + 32) 2555
RR4 (completes + partials)/(completes + partials + estimated eligible) 37.0%