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The Mokken package was used to test for items which produce monotonically non-decreasing item characteristic curves.
In the final recognition test for items presented as foils in the preceding main experiment, foils were more accurately recognized if they had previously been presented with a conceptual self/other retrieval question than an agentic self/other retrieval question.
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For the Total score all but two items met the test for item convergent validity (correlation range: 0.38-0.72).
Except for one VT item (item 9a), all items passed the test for item internal consistency with correlations between the items and their scales ≥0.40 (Table 1).
All items of the SF-36v2 passed the test for item internal consistency, except for item 9a (Did you feel full of life?).
This technique is used to test for item convergent and discriminant validity, and is based on the examination of item-scale correlations.
To test for item-scale convergence validity, correlations between an item and its own scale of ⩾0.40 (i.e. the correlation coefficient) were used (Hays et al, 1988).
Construct validity was measured using principal component analysis, and the Pearson Correlation test for item-summary score correlation and inter-instrument correlations.
Additionally, all items from the RP, BP, RE, and MH scales passed the test for item discriminant validity with significantly higher correlations between the items and their scales than with the other scales.
Results of the psychometric validation analyses (n=190) indicated that the LPH Emotional and Physical scores met the criteria for convergent and discriminant validity; for the total score all but two items met the test for item convergent validity.
In a second step, opinions were tested between strata using the Mann-Whitney U-test for items on an ordinal scale, in order to find those items where approval rating differed significantly between females and males, consumers and abstainers.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com