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Development of a Rating Scale for Primary Depressive Illness
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1967
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Psychological Co-morbiditiesRating ScaleEducationPsychometricsMental HealthClassical Test TheoryPsychologyMood SymptomComorbid Psychiatric DisorderFactor AnalysisPsychological MeasurementPsychiatryDepressionPsychiatric DisorderMood SpectrumFactor ScoresMedicinePsychopathologyVarimax Rotation
The study further develops a rating scale for depressive states, addressing issues of comparing successive samples, interpreting factor scores, and reporting additional findings. The scale’s items were factor‑analysed via principal components with Varimax rotation, weights for factor scores were provided, and the method for applying the scale to separate male and female samples was detailed.
This is an account of further work on a rating scale for depressive states, including a detailed discussion on the general problems of comparing successive samples from a ‘population’, the meaning of factor scores, and the other results obtained. The intercorrelation matrix of the items of the scale has been factor‐analysed by the method of principal components, which were then given a Varimax rotation. Weights are given for calculating factor scores, both for rotated as well as unrotated factors. The data for 152 men and 120 women having been kept separate, it is possible to compare the two sets of results. The method of using the rating scale is described in detail in relation to the individual items.