Table 2. . Type I error of Sobel test for indirect effect for simulation scenario I assuming sensitivity = (0.70, 0.80, 0.90, 0.95), and specificity = 1.
|
True† |
SN = 0.70 |
SN = 0.8 |
SN = 0.9 |
SN = 0.95 |
H0 (β1b = 0, ϑ2c = 0) |
0% |
0% |
0% |
0% |
0% |
H0 (β1b = 0, ϑ2c = 0) | 4.9% | 27% | 18% | 10% | 6.5% |
†Type I error of Sobel test when the true exposure is used in the regression analyses.
‡Exposure–mediator association from Equation 3.
§Mediator–outcome association from Equation 2.
SN: Sensitivity.