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Table 4 Summary results of convergent and discriminant validity tests

From: Developing and testing an instrument for identifying performance incentives in the Greek health care sector

     Item-Discriminant Validity
   Item-Internal Consistency Range of Correlations4 Test success5
Factors N1    Factors   
   Range of Correlations2 # Success/Total3 1 2 3 4 Level 1 Level 2
1 7 0.558–0.762 7/7 --- 0.376–0.465 0.456–0.549 0.293–.0477 1/21 20/21
2 4 0.604–0.708 4/4 0.410–0.442 --- 0.343–0.442 0.406–0.426 0/12 12/12
3 5 0.535–0.684 5/5 0.406–0.554 0.287–0.406 --- 0.362–0.483 1/15 14/15
4 3 0.550–0.700 3/3 0.436–0.453 0.314–0.491 0.427–0.504 --- 0/9 9/9
  1. 1 Number of items, 2 Range of correlations between items and hypothesized factor corrected for overlap, 3 Number of correlations exceeding the 0.40 standard/total number of correlations, 4 Range of correlations between items and other factors, 5 Successful discriminant validity tests. Level 1: Item-factor correlation is higher for hypothesized scale than competing scales. Level 2: Item-scale correlation is significantly higher for hypothesized scale than competing scales. The default significance level for comparing two correlations is two standard errors. The standard error of a correlation coefficient is approximately equal to 1 divided by the square root of the sample size.