Response rate 1 (R1) Response rate 2 (R2)
Variable Pooled model No recruitment, no incentive Prior recruitment, no incentive Prior recruitment and incentive With incentive No incentive
Beta Sig. Beta Sig. Beta Sig. Beta Sig. Beta Sig. Beta Sig.
Constant -0.46 * 0.33 -0.99 ** 0.65 ** 0.77 ***
Constant no, no -0.68 ***
Constant yes, no -0.74 ***
Constant yes, yes -0.75 ***
Response burden (B) -0.60 *** -1.14 *** -4.06 ** -0.48 *** -0.48 *** -2.07 ***
Time trend (Y) -0.07 ** - -0.06 * - 0.09 ***
N 47 29 8 10 19 18
AIC 83.9 - 81.6 a - 60.7a
AICc b 85.3 - 84.5 a - 62.6 a
R2 0.55 - 0.61 a - 0.17 a
Log likelihood (LL) model -36.9 - -33.8 a - -25.3 a
LL intercept(s) only -49.5 - -49.5 a - -32.4a
McFadden R2 c 0.25 - 0.32 a - 0.22a
Significance levels: * = 10%; ** = 5%; *** = 1%