Reliability studies on the original MMPI indicate that it had moderate levels of tempora1 stability and internal consistency.
For example, Hunsley, Hanson, and Parker (1988) completed a meta-analysis of studies performed on the MMPI between 1970 and 1981, and concluded, "all MMPI scales are quite reliable, with values that range from a low of .71 (Scale Ma) to a high of .84 (Scale Pt)" (p. 45). Their analysis was de- rived from studies that included a wide range of populations , intervals that ranged from one day to two years, and a combined sample size exceeding 5,000. In contrast to Hunsley et a l ., some authors have reported that the fluctuations in some of the scales are sufficiently wide to question their reliabilities (Hathaway & Monachesi, 1963; Mauger, 1972). Proponents of the MMPI counter that some fluctuation in test scores are to be expected. This is especially true for psychiatric populations because the effects of treatment or stabilization in a temporary crisis are likely to be reflected in a patient's test performance (J. Graharn, Smith , & Schwartz, 1986). Bergin (1971) has demonstrated that Scale 2 (Depression) is particularly likely to be lowered after successful treatment. Similarly, Scale 7 (Psychasthenia) would be likely to alter according to a person's external situation. Thus, test-retest reliability may actually be an inappropriate method of evaluating these scales for certain populations. This defense of the test's reliability is somewhat undermined by the observation that test-retest reliability is actually slightly more stable for psychiatric populations than for normals. Whereas the median range for psychiatric patients is about .80, median reliabilities for normals are about .70. Split-half reliabilities are likewise moderate, having an extremely wide range from .05 to .96, with median correlations in the. 70s (Hunsley et al., 1988).
ศึกษาความน่าเชื่อถือ MMPI เดิมระบุว่า มี tempora1 ความมั่นคงและความสอดคล้องภายในระดับปานกลาง For example, Hunsley, Hanson, and Parker (1988) completed a meta-analysis of studies performed on the MMPI between 1970 and 1981, and concluded, "all MMPI scales are quite reliable, with values that range from a low of .71 (Scale Ma) to a high of .84 (Scale Pt)" (p. 45). Their analysis was de- rived from studies that included a wide range of populations , intervals that ranged from one day to two years, and a combined sample size exceeding 5,000. In contrast to Hunsley et a l ., some authors have reported that the fluctuations in some of the scales are sufficiently wide to question their reliabilities (Hathaway & Monachesi, 1963; Mauger, 1972). Proponents of the MMPI counter that some fluctuation in test scores are to be expected. This is especially true for psychiatric populations because the effects of treatment or stabilization in a temporary crisis are likely to be reflected in a patient's test performance (J. Graharn, Smith , & Schwartz, 1986). Bergin (1971) has demonstrated that Scale 2 (Depression) is particularly likely to be lowered after successful treatment. Similarly, Scale 7 (Psychasthenia) would be likely to alter according to a person's external situation. Thus, test-retest reliability may actually be an inappropriate method of evaluating these scales for certain populations. This defense of the test's reliability is somewhat undermined by the observation that test-retest reliability is actually slightly more stable for psychiatric populations than for normals. Whereas the median range for psychiatric patients is about .80, median reliabilities for normals are about .70. Split-half reliabilities are likewise moderate, having an extremely wide range from .05 to .96, with median correlations in the. 70s (Hunsley et al., 1988).
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Reliability studies on the original MMPI indicate that it had moderate levels of tempora1 stability and internal consistency.
For example, Hunsley, Hanson, and Parker (1988) completed a meta-analysis of studies performed on the MMPI between 1970 and 1981, and concluded, "all MMPI scales are quite reliable, with values that range from a low of .71 (Scale Ma) to a high of .84 (Scale Pt)" (p. 45). Their analysis was de- rived from studies that included a wide range of populations , intervals that ranged from one day to two years, and a combined sample size exceeding 5,000. In contrast to Hunsley et a l ., some authors have reported that the fluctuations in some of the scales are sufficiently wide to question their reliabilities (Hathaway & Monachesi, 1963; Mauger, 1972). Proponents of the MMPI counter that some fluctuation in test scores are to be expected. This is especially true for psychiatric populations because the effects of treatment or stabilization in a temporary crisis are likely to be reflected in a patient's test performance (J. Graharn, Smith , & Schwartz, 1986). Bergin (1971) has demonstrated that Scale 2 (Depression) is particularly likely to be lowered after successful treatment. Similarly, Scale 7 (Psychasthenia) would be likely to alter according to a person's external situation. Thus, test-retest reliability may actually be an inappropriate method of evaluating these scales for certain populations. This defense of the test's reliability is somewhat undermined by the observation that test-retest reliability is actually slightly more stable for psychiatric populations than for normals. Whereas the median range for psychiatric patients is about .80, median reliabilities for normals are about .70. Split-half reliabilities are likewise moderate, having an extremely wide range from .05 to .96, with median correlations in the. 70s (Hunsley et al., 1988).
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