External Validation of the MMPI-A-RF with Youth with Mental Health Needs: A Systematic Examination of Symptom-Based Correlates and Interpretive Statements Page: 48
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mean inter-item correlations, all but one MMPI-A-RF RC scales meet recommended guidelines.
Yet, mean inter-item correlations may mask variances in inter-item correlations. Therefore, the
percentage of items falling below the .15 Clark and Watson threshold was also calculated.
Unpredictably, the vast majority of RC scales evidenced at least moderate proportions of items
with low correlations, with two scales-RC8 and RC9-comprising low correlations on nearly
two-thirds of its items.
Table 5
Alphas and Mean Inter-item Correlations of MMPI-A-RF RC Scales
Scale Items a M inter-item Percentage
r of low rsa
RCd 18 .92 .39 3.9
RC1 23 .85 .20 36.4
RC2 10 .69 .18 35.6
RC3 9 .63 .16 44.4
RC4 20 .88 .27 18.9
RC6 9 .72 .22 25.0
RC7 11 .66 .15 50.9
RC8 8 .57 .15 64.3
RC9 8 .47 .10 64.3
M .71 .20 38.2
Note: RCd = Demoralization; RC1 = Somatic Complaints; RC2 = Low Positive Emotions; RC3 = Cynicism; RC4 =
Antisocial Behavior; RC6 = Ideas of Persecution; RC7 = Dysfunctional Negative Emotions; RC8 = Aberrant
Experiences; RC9 = Hypomanic Activation. a Low rs refer to inter-item correlations < .15.
Across both measures of construct validity, RC9 performed by far the worst for scale
homogeneity. Therefore, an item-level analysis was systematically conducted to see if any item
removed would improve alpha. Particularly, item 182 yielded the lowest range of inter-item
correlations, with several producing negative correlations. Furthermore, it produced the lowest48
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Sharf, Allyson J. External Validation of the MMPI-A-RF with Youth with Mental Health Needs: A Systematic Examination of Symptom-Based Correlates and Interpretive Statements, dissertation, August 2019; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc1538766/m1/55/?rotate=90: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .