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Table 1 Empirical simulation-based estimates of test-retest correlation Corr(S test , S retest ) in equation (14)

From: Statistical power as a function of Cronbach alpha of instrument questionnaire items

  Corr(S test , S retest )
  Total N = 30 Total N = 50
C α k = 5 k = 10 k = 5 k = 10
0.1 0.10 0.10 0.10 0.10
0.2 0.20 0.20 0.20 0.20
0.3 0.30 0.29 0.30 0.30
0.4 0.39 0.39 0.40 0.39
0.5 0.49 0.50 0.49 0.50
0.6 0.59 0.59 0.60 0.60
0.7 0.69 0.69 0.70 0.70
0.8 0.79 0.80 0.80 0.79
0.9 0.90 0.90 0.90 0.90
  1. Note: Total N: total number of subjects; C α : Cronbach alpha; k: number of items