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Synthetic Aperture Personality Assessment
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Synthetic Aperture Personality Assessment : ウィキペディア英語版
Synthetic Aperture Personality Assessment
Synthetic Aperture Personality Assessment (SAPA) is a method used for telemetric assessment of individual differences, primarily in the context of online surveys. The SAPA method uses data collected from the administration of large inventories of personality assessment items to large pools of participants, though it differs from traditional data collection methods in that each participant responds to only a small subset of all available items. In other words, each participant receives a random (or partially random) subset of the items under study. As long as some of the items are overlapping between pairs of participants, the smaller subset is more palatable for individual participants yet can be combined to synthesize large covariance matrices (with considerable data missing at random). In this way, the SAPA methodology is well-suited for assessing personality and individual differences across multiple domains.〔http://www.personality-project.net/revelle/publications/telemetrics.10.pdf〕 It is also a highly efficient means for new item prototyping and scale construction.〔http://www.personality-project.org/condon/ISSID.pdf〕
==The SAPA Methodology==

The procedure is straightforward. From a large set of personality and ability items , a smaller subset of items are presented to any one subject. With random sampling of the items, all possible pairs of items are eventually presented together. As the number of subjects grows, each item has been given to subjects, and each pair of items has been given to subjects. The (online survey ) 〔(http://sapa-project.org/ )〕 developed by William Revelle (and maintained by the (Personality, Motivation, & Cognition Lab )〔http://personality-project.org/pmc.html〕 at Northwestern University) has used this technique with approximately 200,000 participants as of 2012. In this example, each participant receives a subset of items equal to approximately 75, though the full set of items being administered at any given time may be as high as 500.

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