Least Squares Data Analysis with the ZX80/81

One of the most common tasks of a computer is to perform statistical analysis and data manipulative type computations. Many of the computations involved are very tedious to perform by hand since they sometimes require a large number of reiterative calculations. Statistical analysis problems that take hours for a human (equipped only with pencil and paper) are solved in a matter of seconds with a computer. This article presents a program which computes some simple statistical quantities commonly used by engineers and scientists.