Original Construction Methodology
The first empirical trials were conducted by Hendrickson on a small group of 115 people (67 males / 48 females) in 1958.
Frequency distributions of responses were recorded and words were re-combined in tetrads such that each tetrad contained a word relating to each dimension. Moreover, attempts were made to combine words of relatively equal response strength in order to reduce the effects of social desirability in response patterns. High response words were grouped together with other high response words, low response words with other low response words. 76 of the original 96 words were absorbed in this manner and five extra tetrads were constructed to bring the total once more to twenty four. Of the words retained 39% are the same as in Marston’s original model.
Read more about this topic: Thomas Personal Profile Analysis (PPA)
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