Provides a graphical means for assessing and communicating the dynamic (time-based) behavior of a process input (or process output) and for evaluating the dynamic effects on the output as process inputs change.
|When to Use||Purpose|
|Start of project||Assist in project selection by identifying process outputs that exhibit shifts, changes in variation, or changes in time-based patterns in response to changes in process inputs.|
|Mid-project||Graph the data before running any statistical tests. This is the first rule of data analysis. Time series plots are often used to investigate the effects of making controlled changes to a process input, with the data collected at specified time intervals.|
|Mid-project||Assess whether an input (X) has a strong relationship with an output (Y) to help eliminate noncritical X's from consideration.|
|End of project||Graphically compare the dynamic behavior of the pre-project process with the dynamic behavior of the post-improvement process.|
One numeric variable (continuous or discrete) with optional categorical variables.