The probability of endorsing each multiple-choice item alternative of the Group Personality Projective Test was correlated with the probability of endorsing the alternative as the most socially desirable. The results indicate that about 53% of the measured variance of the test can be attributed to the influence of social desirability. A possible reason for the finding that social desirability has less influence on the test than has been demonstrated with True-False type inventories was discussed. The results suggest caution in evaluating the discriminative validity of the test.
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