% In-Tolerance Worksheet Features 
Because of false accept and false reject risk, the percentage of subject parameters perceived to be in-tolerance in a tested or calibrated population of parameters will be different from the "true" percentage of in-tolerance parameters.  The % In-Tolerance Worksheet can be used to estimate what the true in-tolerance percentage is, based on an observed percentage, or to estimate what the observed percentage will be, based on a presumed true percentage.  The % In-Tolerance Worksheet is accessed by selecting True vs. Observed % In-Tolerance on the Main Screen Options menu or clicking the corresponding icon on the Toolbar.  Worksheet features are described below.
 
Observing Parameter Information
If the subject parameter is evaluated using the measuring parameter you are presently working with, then the Current MTE option should be selected.  For this option, the observed % intolerance is entered in the Observed box and the Compute button clicked.  This instructs AccuracyRatio to iterate toward an estimated true % in-tolerance, which is displayed in the True box.  Conversely, an expected observed % in-tolerance can be estimated by entering a presumed true % In-tolerance in the True box and clicking the Compute button. 

If the observed percent in-tolerance was obtained using a measuring parameter other than the one you are presently working with, then the Other option should be selected.  In doing this, you have the option of entering new identification data or leaving the parameter identification as is and focusing on parameter tolerance (± Offset) and in-tolerance percentage (Error Confidence Level) information only.  The observed % in-tolerance is entered in the Observed box, or the presumed true % in-tolerance is entered in the True box, and the Compute button clicked.

Clicking OK on the menu will cause the estimated true or observed % in-tolerance to be written in the Subject Unit % In-Tolerance box on the Main Screen and instruct AccuracyRatio to automatically recalculate the risks and equivalent accuracy ratio.  Conversely, new entries or changes are ignored and the worksheet closed by selecting Cancel on the menu.

Observed Parameter % In-Tolerance
If desired, guardbands can be used to accommodate guardband test limits.  In this case, the Use Guardbands option is selected.  Guardbands are established via the Guardband Analysis Worksheet , which is accessed by clicking the Guardband Worksheet button.  Once guardbands and multipliers have been established, these values are displayed in the Guardband Data section of the % In-Tolerance Worksheet.  The observed % in-tolerance is then entered in the Observed box, or the presumed true % in-tolerance is entered in the True box, and the Compute button clicked.

Alternatively, guardbands may be computed to ensure that the observed % in-tolerance will be equal to the true % in-tolerance.  These guardbands are computed by selecting the Equalize Obs to True option and clicking the Compute button.  The computed guardbands and associated multipliers are displayed in the Guardband Data section of the worksheet.  The Guardband Analysis Worksheet is also updated to reflect these values.

Clicking OK on the menu will cause the estimated true or observed % in-tolerance to be written in the Subject Unit % In-Tolerance box on the Main Screen and instruct AccuracyRatio to automatically recalculate the risks and equivalent accuracy ratio. Conversely, new entries or changes are ignored and the worksheet closed by selecting Cancel on the menu.
 

Guardband Data

This section displays the guardband multipliers and limits computed via the Guardband Analysis Worksheet, which can be accessed by clicking the Guardband Worksheet button.