The Control Limit Calculation Form calculates control limits for numerous control charts, each with a number of different calculation methods.

The Variables charts, X-bar, Median, X, R, s, and s^{2}, have a number of different options which can be used to determine the process variation used to determine the control limits. These options include the average and median range, average and median standard deviation, average variance, moving range of the means, standard deviation of the means, or a known standard deviation. Variables charts also provide estimates of the population standard deviation, sigma.

The Attributes control charts have approximate and exact limit calculations as an option. The exact limits for the p and np charts are based on the Binomial Distribution. The exact limits for the c and u charts are based on the Poisson Distribution.

The number of standard errors for each chart may also be modified. The default is 3.

**File**provides the ability__Save__or Print the output, or return to the__Main Form__.**Edit**allows__Editing Output Text__by cutting, copying, pasting, and undoing entry.**View**provides the ability to enlarge/reduce the Form size for easier viewing.**Help**provides access to this Website.

- These buttons provide quick access to the following tasks.
- Returns to last Form or the
__Main Form__. -
__Saves__the output to a file. - Prints the Text.
- Copies Selection to the clipboard.
- Pastes Text from the clipboard
- Enlarges/Reduces Form size for easier viewing.
- Brings up the
__Main Form__. - Brings up the Help file.
- Hides the form.

Select this Tab for Mean chart calculations.

Select this Tab for Median-chart calculations.

Select this Tab for X-chart calculations.

Select this Tab for R-chart calculations.

Select this Tab for s-chart calculations.

s^{2} Tab

Select this Tab for s^{2}-chart calculations.

Select this Tab for p-chart calculations.

Select this Tab for np-chart calculations.

Select this Tab for c-chart calculations.

Select this Tab for u-chart calculations.

Enter the centerline here.

Enter the statistic value here. The statistic to enter is set by the *Statistic Used* option.

Enter the sample size here.

Select the statistic to use in the limit calculations here.

Changes the number of decimal places, from 0 to 9. Change may be made by selecting and typing in the number, or by using the incrementing buttons.

Enter the number of Standard Errors to use in the limit calculations here. The default is 3.

The calculation output is displayed here when is clicked. You may save, print, edit, cut, copy, and paste text in this area.

Performs calculations and displays output.