[MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] and the point
biserial correlation coefficient between the logit and the observed outcome ([r.sub.pbi) is .53.
On this occasion 14 of the 16 point
biserial correlations computed across the 30 subjects for each card were positive as predicted (p [less than] .005, binomial test, one-tailed).
The evaluation of the integrative neuropsychological parameters of subcortical-frontal function as disease liability factors was defined by calculating the point
biserial correlation coefficients on the basis of the means and standard deviations of patients' and healthy controls' features, taking into account the prevalence of schizophrenia in the common population.
Al calcular la formula 16, para el coeficiente phi
biserial ([[fi].sub.bis]), se obtenian valores mayores a 1 en los estudios 6, 7 y 11:
Notes: Uncorrected correlations are point
biserial correlations.
For categorical variables Phi Coefficient (2 x 2 table) and Cramer's Phi (larger than 2 x 2 table) were used, and for one continuous and one categorical variable, the point
biserial correlation coefficient was used (Lindeman, Merenda, & Gold, 1980).
Item analysis revealed that all items had at least a .30 point
biserial correlation with the total score.
Significant point
biserial correlation [rpbi (1478) = .3019, p <.01] between FRP and place of residence also indicate that FRP varies significantly according to place of residence (table 4).