Crystallized Intelligence (Gc) refers to one's ability to use acquired knowledge to solve problems. Because crystallized intelligence deals with learned information, Gc increases with age and educational attainment and can be tested well by assessments of verbal ability, such as vocabulary and cloze tests. What's more, the items in this test were pulled from publicly accessible, old SATs (Scholastic Aptitude Tests), so this assessment should provide a near-perfect measure of crystallized intelligence. Moreover, the SATs that this test was derived from are considered valid measures of intelligence and were accepted for admission purposes to many high IQ societies, including the International High IQ Society and Triple Nine Society.

To answer each question, test-takes must select the option which best completes each sentence. An example would be selecting "gradual" to complete the sentence "Medieval kingdoms did not become constitutional republics overnight; on the contrary, the change was -------."

This test has 30 questions and a 15 minute time limit. The questions are ordered from least to most difficult. For an accurate score, do not use any aids to complete this test, and take it only once.

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Fluid Intelligence (Gf) refers to one's ability to recognize patterns within, and make sense of, novel information. Because fluid intelligence deals with novelty, it can be tested well by assessments of reasoning ability which are comprised of non-verbal, foreign, and abstract items. Moreover, for unknown reasons, fluid intelligence tends to increase until early adulthood (the mid-20s to early 30s), and decline precipitously until death. What's more, the norm for this test was extrapolated from the results of 705 teenagers and young adults, so relatively older people may receive seemingly deflated scores on this test, as the scores here are not age-adjusted.

To answer the questions on this test, test takers should select the options that complete the patterns that are presented to them.

This test has 30 questions and a 15 minute time limit. The questions here span a wide range of difficulty and complexity and are placed in a pseudo-random order. For an accurate score, do not use any aids to complete this test, and take it only once.

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The procedure to derive an FSIQ from results from these tests is too complicated to present a table that directly converts composite raw scores to FSIQs. To derive an FSIQ from sub-test scores, subtract 100 from both scores and place them into this formula: (.58(x+y))+100. For example, a Verbal score of 137 and a Non-verbal score of 142, when being converted to an FSIQ, should appear as such: (.58(37+42))+100. The resulting FSIQ from this example would be 145. The minimum and maximum scores on this test are 43 and 155. To see the rarity of a particular score, visit this page.

The two sub-tests have a moderately high positive correlation (.58), and correlate with FSIQs very highly. Scores on the Non-verbal test have a .89 correlation with FSIQs, and scores on the Verbal test have a .88 correlation with FSIQs. The two tests have a common factor loading of .76.

This test was developed to be very similar to the WASI-II (FSIQ-2), which is an abbreviated form of the WAIS-IV, which is considered to be the gold standard of IQ tests. Moreover, in a very small, preliminary sample, PDIT FSIQs had a .85 correlation with WAIS-IV FSIQs. The raw data used to obtain these statistics can be viewed here, and a 9-page paper that examines statistics regarding this test, and provides an overview of the methods and theories behind the construction of the test, can be viewed here.

Furthermore, although this test, if done properly appears to provide a reasonably accurate measure of general intellectual ability, it is not uncommon for individuals to get slightly, and even moderately different results on assessments that correlate highly when many scores are considered.

Questions and concerns should be emailed here: antjuanfinch@alumni.harvard.edu .