![summary of reliability and validity of mmpi 2 summary of reliability and validity of mmpi 2](http://image1.slideserve.com/2259623/table-12-1-mmpi-2-clinical-scale-n.jpg)
Three independent variables are manipulated: (1) presence versus absence of quality control items that are sometimes referred to as attention checks, (2) grouping items from a scale next to each other in the survey versus randomly scrambling items from different scales at different places in the survey, and (3) collecting self-report data in an anonymous manner by which the respondent cannot be matched to their responses versus collecting data confidentially whereby respondents affix their name to their survey and their responses can be matched to them. This study seeks to examine the impact of study design and administration characteristics that can be manipulated before data are collected in the hopes of maximizing score reliability. These mixed results suggest that a priori machinations by survey designers and administrators may often result in unwanted differences in score reliability. Although most of the exploratory interaction tests for each scale were statistically significant, none were in the direction implied by the confluence of main effect hypotheses. The use of quality control items had no impact on alpha on any scale, confidentiality improved alpha on one scale and decreased it on two others, and grouping items together improved alpha on two scales and decreased it on another.
![summary of reliability and validity of mmpi 2 summary of reliability and validity of mmpi 2](https://i.pinimg.com/236x/7b/be/24/7bbe2469ba409f102b2fdb6f4f7a3873.jpg)
The ANOVA results were mixed for the three personality scales. These summary data were then used in analysis of variance tests. Hakstian and Whalen’s (1976) formulae were used to calculate the standard deviation of alpha. Alpha was calculated for each of the eight treatment groups. The experimental conditions are presence versus absence of quality control items, anonymous versus confidential administration conditions, and randomly scrambled items versus grouped survey items. Using a two-by-two-by-two cluster randomized post-test only experimental design, the Cronbach’s coefficient alpha of internal consistency reliability of scores on three personality scales is calculated. The a priori impact of survey design and implementation tactics on score reliability is not well-understood.