NeoCal Documentation

NeoCal for Palm OS User Guide

Statistical Registers

This application uses the statistical registers and performs one- and two-variable statistical calculations such as mean, standard deviation, and linear regression. The statistical registers are represented by the , , , , , and buttons. However, these registers are not modified using the button, rather, data is accumulated into these registers by using:

  • to clear the statistical registers.
  • to accumulate a data point into the statistical registers. The data point can be either a single x value or an (x, y) pair. The number of accumulated data points is displayed. As with all NeoCal operations, the y value is entered before the x value.
  • to remove a data point from the statistical registers. This is useful for correcting mistakes.

The accumulated statistics can be recalled by simply pressing these buttons:

  • recalls the number of data points accumulated.
  • recalls the summation of the x values.
  • recalls the summation of the squares of the x values.
  • recalls the summation of the y values.
  • recalls the summation of the squares of the y values.
  • recalls the summation of the products of the x and y values.
  • recalls the summation of the x values into the x register and the summation of the y values into the y register.

The Statistical dialog displays the current values of all the summary registers used by the statistical calculations. Use the Preferences dialog to assign a section of the display for quicker access to this dialog.

Let's enter some data,

  1. Press to clear the statistical registers.
  2. Press (in RPN mode, use ) to accumulate the first data point.
  3. Press to accumulate the second data point.
  4. Press to accumulate the third data point.
  5. Press to accumulate the fourth data point.
  6. Press to recall the sum of the x values (245).
  7. Press to recall the sum of the squares of the x values (17,725).
  8. Press to recall the number of accumulated data points.