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The NEO Personality Inventory, authored by Paul T. Costa, Jr. and Robert R. McCrae, is one of the most widely used commercial inventories for measuring the five major domains (and facets of those domains) of personality. Decades of research support the reliability, validity, and utility of the scales of the NEO PI. Even though the NEO PI is one of the best available measures of normal personality, its commercial status creates several drawbacks for potential users. Cost can be a factor for those without funding. Copyright disallows administering a partial or edited version of the NEO PI, as well as presenting this inventory on the Web. To overcome the drawbacks of the NEO PI (and other commercial personality inventories), Lewis R. Goldberg of the [Oregon Research Institute (ORI)][1] created a set of public domain items called the [International Personality Item Pool (IPIP)][2]. By administering items from the IPIP along with the NEO PI and other commercial inventories to a community sample, ORI researchers were able to construct reliable scales that correlate strongly with scales from commercial inventories, including a 300-item analog for the NEO PI, or IPIP-NEO. Since the creation of the original IPIP-NEO, at least two 120-item IPIP-NEO inventories have been created. Some information on the IPIP versions of the NEO PI are available on [the IPIP website][3]. This OSF project adds to that information, including raw data collected with both a 300-item and 120-item IPIP version of the NEO PI. [1]: [2]: [3]:
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