Ian E. Bush, Medical College of Virginia, Richmond,

Virginia

The major section of this program is the "Main Arithmetic

IX" which consists of four initializing statements; an input

section; a weighting section; a section which cumulates

means, sums of squares, etc.; a section which calculates

the relevant regression coefficients, etc.; and a sections

which calculates confidence limits as variances.

The section which calculates the relevant regression co-

efficients allows for both cases of linear regression, and in

the computation of standard error of the intercept, uses

(N-2) degrees of freedom to provide a better estimate for

small values of N while providing negligible differences

from conventional calculation when N is larger.

The section which calculates confidence limits as variances

provides a calculation of the variance of the error of the

estimate of the dependent variable again using (N-2) degrees

of freedom for the general case. This calculation is fully

corrected for both random variance within the tested pop-

ulation of data and for the difference between the inde-

pendent variable and the mean of the independent variable

for the population of data.