Linking Vertical Jump and Standing Broad Jump Tests: A Testing Equating Application

This study evaluated test-equating methods to enable comparisons and conversions between the vertical jump (VJ) and standing long jump (SLJ) tests. A total of 528 youth (280 males) performed VJ and SLJ, and their scores were randomly split as the calibration (C) sample (n = 478) and cross-validation (CV) sample (n = 50). SLJ scores of the C sample were equated to the scale of VJ using linear and equipercentile equating, and established conversion between the tests was applied to SLJ scores of the CV sample. Overall, the correlations between VJ and equated VJ were moderately high to high and the absolute differences were small in both C and CV samples. There was little difference between the equating methods, but the results of the equipercentile method were used because it could provide a more robust conversion in theory. The conversion should be further crossly validated with large, more diverse samples.