Reliability and validity studies on the MCMI indicate that it is generally a well- constructed psychometric instrument. Measures of internal consistency have been par- ticularly strong. For the MCMI-III, alpha coefficients exceed .80 for 20 of the 26 scales, with a high of .90 for the Major Depression scale and a low of .66 for Compulsive (Mil- lon, 1994, 1997). Test-retest reliabilities have been moderate to high. The MCMI-III manual reports that over a 5- to 14-day interval, test-retest reliability had a median of .91 (the high was .96 for Somatoform and the low was .82 for Debasement). Craig (1999) has summarized three data sets on test reliabilities ranging from 5 days to 6 months by stating that the median reliability was .78 for the Personality scales and .80 for the Clin- ical Syndrome scales. Much longer term test-retest reliabilities spanning 4 years ranged from a high of .73 for Passive-Aggressive to a low for Dependent of .59 (Lenzenweger, 1999). This is roughly equivalent to other stable dimensions of personality.
Reliability and validity studies on the MCMI indicate that it is generally a well- constructed psychometric instrument. Measures of internal consistency have been par- ticularly strong. For the MCMI-III, alpha coefficients exceed .80 for 20 of the 26 scales, with a high of .90 for the Major Depression scale and a low of .66 for Compulsive (Mil- lon, 1994, 1997). Test-retest reliabilities have been moderate to high. The MCMI-III manual reports that over a 5- to 14-day interval, test-retest reliability had a median of .91 (the high was .96 for Somatoform and the low was .82 for Debasement). Craig (1999) has summarized three data sets on test reliabilities ranging from 5 days to 6 months by stating that the median reliability was .78 for the Personality scales and .80 for the Clin- ical Syndrome scales. Much longer term test-retest reliabilities spanning 4 years ranged from a high of .73 for Passive-Aggressive to a low for Dependent of .59 (Lenzenweger, 1999). This is roughly equivalent to other stable dimensions of personality.
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