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We cross-validated gene array by the mean of correlation index of 12 genes present in two or more different arrays (signal transduction vs apoptosis: r = 0.956; apoptosis vs DNA-damage: r = 0.986; signal transduction vs DNA-damage: r = 0.999).
The graphical comparison of the pre and post-test knowledge exams results are shown in Figures 1, 2, 3 and 4. Regarding the supplementary evidence obtained in the courses' curricular summative evaluations, the 60-item MCQ exams had an average Cronbach's alpha of 0.83, a mean difficulty index p-value of 0.66 and a mean point-biserial correlation index of 0.29.
The mean point biserial correlation index (a discrimination index that describes the relationship between a student's response to a question and the total score on the test; it is useful to differentiate among students in terms of ability) of the diagnostic post-test was 0.2, and the discrimination index of the summative exams ranged from 0.24 to 0.38.
On the contrary, Jaccard correlation index is defined as a harmonic mean between two probability density functions and expresses a scalar sum of two vectors.
Plotting data as boxplots allows for a simple visual examination of how pairs of indices are related in general (the mean correlation) and whether correlations are consistent among groups or over time (the width of the boxes and whiskers).
To analyze items, we calculated the discrimination index (the corrected item-total correlation index); a discrimination index less than 0.2 mean the item is troublesome and should be excluded from the measure.
**Position indices randomly starting from the patients' left or right, mean correlation and standard deviation from 500 tests Open image in new window Fig. 4 Pearson correlations found during the validation step.
Bureau of mines correlation index.
Sk = Spearman's correlation index.
The actual radiograph is compared to a set of DRRs by means of a cross-correlation index.
Connectivity indices were determined using normalized mean correlations within and between three regions of interest activated for the finger motion task.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com