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Table 14 Calculation of Response Rate

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

 

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*

73.0%

Estimated eligible (e x (22 + 23 + 31 + 33)) + (21 + 32)

2555

RR4 (completes + partials)/(completes + partials + estimated eligible)

37.0%