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. Author manuscript; available in PMC: 2025 Jan 1.
Published in final edited form as: Multivariate Behav Res. 2023 Jul 17;59(1):1–16. doi: 10.1080/00273171.2023.2229079

Table 4.

Predicted and Approximate Simulated Sample Size Requirements N for Fixed Effect Sizes

Scenario One Wave Two Waves
Predicted
N Required		 Simulated
N Required		 Predicted
N Required		 Simulated
N Required
Odds Ratio MPB CPB MPB CPB
Pre-post correlation 0.06
1.5 1152 1154 1157 1149 1087 1153
2 414 415 413 413 389 412
3 176 176 167 175 165 165
Pre-post correlation 0.3
1.5 1209 1211 1210 1090 1040 1091
2 408 408 411 368 351 371
3 175 175 169 159 151 152
Pre-post correlation 0.6
1.5 1192 1191 1182 753 735 745
2 430 429 431 277 270 269
3 176 176 172 118 115 109

Notes. “MPB” = marginal-probabilities-based (expression 3); “CPB” = conditional-probabilities-based (expression 5). The data-generating model settings are the same as those used for Table 3.