Stability Study - Graphsmain topic see also
Stability Study - GraphsStat > Regression > Stability Study > Stability Study > Graphs
Display shelf life plots to show the linear change in the response over time. Display residual plots for diagnosis of the regression model fit.
Shelf life plot: Check to display shelf life plots, which show the linear change in the response over time.
Batch is a fixed factor
If batch is a fixed factor and is included in the final model, then you can specify how many batches to show on the combined plot and whether to show individual plots for each batch. If batch is a random factor or is not included in the final model, then Minitab displays a single plot that shows all batches.
Options for combined plots
No combined graph: Choose to not display plots that show multiple batches.
Combined graph for all batches: Choose to display all the batches on a single plot.
Combined graphs with 4 batches per graph: Choose to display no more than 4 batches on each plot. For example, if you have 12 batches, Minitab displays 3 plots that each show 4 batches.
Options for individual plots
No graphs for individual batches: Choose to not display a separate shelf life plot for each batch.
Graphs for individual batches: Choose to display a separate shelf life plot for each batch.
Residuals for plots: You can specify the type of residual to display on the residual plots. See Choosing a residual type.
No batch factor or batch is a fixed factor
Regular: Choose to plot the regular (also called raw) residuals.
Standardized: Choose to plot the standardized residuals.
Deleted: Choose to plot the Studentized deleted residuals.
Batch is a random factor
Marginal regular: Choose to plot the marginal residuals.
Marginal standardized: Choose to plot the standardized versions of the marginal residuals.
Conditional regular: Choose to plot the conditional residuals.
Conditional standardized: Choose to plot the standardized versions of the conditional residuals.
Residual Plots
Individual plots: Choose to display one or more plots.
Histogram of the residuals: Check to display a histogram of the residuals.
Normal probability plot of the residuals: Check to display a normal probability plot of the residuals.
Residuals versus fits: Check to plot the residuals versus the fitted values.
Residuals versus order: Check to plot the residuals versus the order of the data. The row number for each data point is shown on the x-axis.
Four in one: Choose to display a layout of a histogram of residuals, a normal plot of residuals, a plot of residuals versus fits, and a plot of residuals versus order.
Residuals versus the variables: Enter one or more columns that contain the variables against which you want to plot the residuals. Minitab displays a separate graph for each column.