[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
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).