Gage Repeatability & Reproducibility Results - Descriptives/Plots Tab

Select the Descriptives/plots tab of the Gage Repeatability & Reproducibility Results dialog box to access the options described here.

Descriptive stats (by operator & part)

Click the Descriptive stats (by operator & part) button to display two spreadsheets. The first spreadsheet displays the means, standard deviations, and minimum and maximum values for each operator in the study. The second spreadsheet displays those statistics for each part in the study.

Repeatability & reproducibility plot

Click the Repeatability & reproducibility plot button to display the standard plot to summarize the results of a repeatability and reproducibility study with multiple trials. This plot is discussed in detail in the Introductory Overview. To review, each point in this plot represents the deviation of the respective measurement from the average rating of the respective part (across trials and operators). Multiple trials (measurements) are connected by a vertical line. The dashed line within each box represents the average deviation of the respective operator from the average ratings by all operators. Thus, use this plot to simultaneously visualize the bias of each operator when rating the parts, the variability within each operator (height of the box), as well as the variability across trials for each part and operator (the length of the vertical lines). Put another way, if there is perfect reproducibility, the dashed lines for all operators will be at exactly the same level (at zero). If there is perfect repeatability, all repeated trials will yield identical results; thus all vertical lines will be of "zero height," that is, only points will be visible in the plot.

Combined plot by operators & parts

Click the Combined plot by operators & parts button to display a plot that shows the average ratings of each part by each operator. Use this plot to examine the extent to which different operators produced similar patterns of ratings across parts. Refer to the Introductory Overview to learn more about how to interpret these plots.

Box & whisker plot

Click the Box & whisker plot button to display a plot in which you can examine the distribution of measurements across parts, by operators. For each operator, this plot indicates the maximum and minimum measurements (Min/Max, shown as whiskers), the 25th and 75th percentile (25/75%, shown as a box), and the median (indicated by a square point marker). Note that you can select the desired method of computing percentiles in the Options dialog box - Analyses/Graphs: Limits tab (accessible by selecting Options from the Tools tab or menu). For more information, see Percentile Calculation Options in Statistica.

Note: Multiple trials: If there are multiple trials, then this plot is constructed to reflect the distribution of the average measurements; that is, before producing the plot, Statistica will first compute for each operator and part the average of the multiple measurements (trials).

Range chart by operator

This button is only available if a study with multiple trials is being analyzed; it is not available if an abridged single-trial study is being analyzed. Click the Range chart by operator button to produce a range (R) chart across parts, by operators. The general idea of an R chart for controlling variability is explained in the Overviews to Quality Control.

by part

The Range chart by part button is only available if a study with multiple trials is being analyzed; it is not available if an abridged single-trial study is being analyzed. Click the Range chart by part button to produce a range (R) chart across operators, by parts. The general idea of an R chart for controlling variability is explained in the Overviews of Quality Control.

Sigma chart by operator

This button is only available if a study with multiple trials is being analyzed; it is not available if an abridged single-trial study is being analyzed. Click the Sigma chart by operator button to produce a Sigma (S) chart across parts, by operators. The general idea of an S chart for controlling variability is explained in the Overviews of Quality Control.

by part

The Sigma chart by part button is only available if a study with multiple trials is being analyzed; it is not available if an abridged single-trial study is being analyzed. Click the Sigma chart by part button to produce a Sigma (S) chart across operators, by parts. The general idea of an S chart for controlling variability is explained in the Overviews of Quality Control.