This macro uses summarized data to produce an Xbar chart and either an R
chart or an S chart.
Download the Macro
Be sure that Minitab knows where to find your downloaded macro. Choose
.
Under
Macro location
browse to the location where you save macro files.
Important
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Download button, the file may open in Quicktime,
which shares the .mac file extension with Minitab macros. To save the macro,
right-click the
Download button and choose
Save target as.
Required Inputs
- One value or a column of
mean values
- One value or a column of
subgroup sizes
- One value or a column of
standard deviations or ranges
Optional Inputs
- TEST K
- Use to specify non-default tests (1-8) for special causes.
- 1 - One point more
than 3 sigmas from center line
- 2 - Nine points in a
row on same side of center line
- 3 - Six points in a
row, all increasing or all decreasing
- 4 - Fourteen points
in a row, alternating up and down
- 5 - Two out of three
points more than 2 sigmas from center line (same side)
- 6 - Four out of five
points more than 1 sigma from center line (same side)
- 7 - Fifteen points in
a row within 1 sigma of center line (either side)
- 8 - Eight points in a
row more than 1 sigma from center line (either side)
- HPROCESS C
- Use to specify a historical grouping column to define historical
stages in the process data. The control limits and center line are then
estimated independently within each stage. Stages are much like groups in other
Minitab graph commands. Thus, the HPROCESS column is like a group variable in
other graph commands, with one exception -- whenever the value in the column
changes, a new stage starts. This works the same way the subgroup column works
in the control chart commands.
Running the Macro
Suppose C1 contains the means, the subgroups were all of size 3, and C3
contains the ranges for each subgroup. To run the macro, choose
and type:
%QCSUMMARY;
MEAN C1;
RANGE C3;
SIZE 5.
Click
Run.
