*Regres -- Multiple Linear Regression

Summary

*REGRES is a suite of four sequentially linked FOCAL-12 programs designed to perform multiple linear regression analysis on a PDP-12 computer running the DIAL monitor. The system is designed to handle up to nine predictor variables, though this limit can be adjusted.

The program suite consists of the following components:

• *CORDATA: Manages raw data entry, storage, and corrections.
• *CORMAT: Calculates means, standard deviations, and the intercorrelation matrix.
• *INVERSE: Uses the Gauss-Jordan algorithm to calculate the inverse of the intercorrelation matrix.
• *BETA: Calculates and prints the standardized regression coefficients, raw-score regression weights, intercept, and the squared multiple correlation coefficient.

The document includes operating instructions, technical details regarding required tape files, guidance on how to perform modifications (such as increasing the number of predictors or conducting stepwise regression), the full program listings, and a sample run to demonstrate the user interface. No prior programming knowledge is required for the end user to operate the system.