LSPoly

LSPoly is a Least Squares Polynomial Regression App, created to aid in the reduction of experimental data to polynomial representations of order [0..5]. The data and polynomial curves are presented in a color-coded graphic together with the percent root mean square (rms) error for each polynomial. The user may also add error bars to the input data points and rms error bands to the polynomial curves to aid in selecting the "best" one.

The user may enter up to 500 data points for analysis using a choice of custom keypads. Although the data input windows show only ten data points at a time, an auto-scaling vertical slider allows the user to examine and edit all data. The user may also flag individual data points to be ignored in the calculations.

The input data and results may be saved to, and retrieved from, text files accessible through the iPad's Files app or a computer's Finder/iTunes app. Screen images may be captured to the iPad's Photos app and printed to AirPrint-capable printers.

To protect against accidental data loss, LSPoly has an autosave feature which continuously backs up the input data