Histogram and One-Factor Analysis of Variance

This document serves as the program library write-up for a FOCAL-12 software package designed for the PDP-12 computer system. The program provides a set of tools to perform three main statistical and data visualization functions: data storage, histogram construction, and one-factor analysis of variance (ANOVA).

Key features include:

• Data Handling: The program accepts integer data via teletype, stores the data on LINC tape, and allows for error correction. It also computes basic descriptive statistics, including the minimum, maximum, and second-smallest/largest values.
• Histogram Construction: Users can generate histograms on the PDP-12 scope, with the system providing automated coordinate calculations for boundaries and intervals (supporting up to 95 intervals).
• Statistical Analysis: The package performs two types of one-factor ANOVA—repeated measures and completely randomized designs. It processes raw data to compute sums, sums of squares, mean squares, F-ratios, and degrees of freedom, outputting the final results in a structured tabular format.

The document includes technical requirements (PDP-12, two TUS5 tape units, 8K memory), operational instructions for loading and running the various program segments, and the source code listings for the package.