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In 1909 Burt published his experimental tests on general intelligence, in which he used factor analysis to define the kinds of factors at play in psychological testing (factor analysis involves the extraction of small numbers of independent factors from a large group of intercorrelated measurements).
For validity testing, factor analysis and item analysis were conducted; and for reliability testing, internal consistency and test-retest reliability methods were used.
Twenty healthy male subjects (mean age = 24.2 years) were recruited into a 2 × 2 repeated measures design; factor 1, minocycline vs placebo (100 mg twice daily for 3 days prior to testing); factor 2, hippocampal dependent vs non-hippocampal dependent memory.
The multiple testing factor is the expected number of overlaps between the two subsets of the given sizes, given the two platforms P1 and P2.
The study phases were as follows: first, preparing item tool; second, content analysis by a panel of specialists; and third, psychometric testing (factor analysis, a reliability coefficient and inter-item correlations).
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Corresponding values for these coded values were given for each tested factor.
Average transcriptional effect (log2) of each tested factor on ESR2 target genes.
Row entries describe divergence along each Relative Warp (PC of shape variables) determined from pairwise comparisons within each tested factor.
The effect of all the tested factors is statistically significant.
The response surfaces were plotted to study interactions among tested factors.
Fig. 5 a Pareto charts ranking the standardized effects of the tested factors.
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