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Statistical Reference Guide
Control charts
Time-weighted control charts
Creating a UWMA control chart
Plot a UWMA control chart to determine if a process is in a state of statistical control.
Select a cell in the dataset.
On the
Analyse-it
ribbon tab,
in the
Statistical Analyses
group,
click
Process Control
, and then click
UWMA
The analysis task pane opens.
In the
Model
drop-down menu:
If the data are individual observations, select
Process variable
.
If the data are rational subgroups, select
Process variable with Subgroups
.
In the
Process
drop-down list, select the quality characteristic variable.
If the data are collected in subgroups, in the
Sample size
group:
If the subgroups are identified by a variable, select
Subgroup by identifier variable
, and in the
Id
drop-down list, select the subgroup identifier variable.
If the subgroups are a constant size and formed by consecutive number of observations of the process variable,
Subgroup size constant
, and in the edit box, enter the number of consecutive observations per subgroup.
Optional:
If the data are individual observations, in the
Id
drop-down list, select an identifier variable
In the
Span
edit box, type the number of consecutive values to compute the UWMA statistic.
In the
L
edit box, type the multiple of the process sigma to define the control limits.
Optional:
To reset the value of the UWMA statistic after each out-of-control signal, select the
Reset after out-of-control signal
check box.
Optional:
To specify known process parameters, select the
Known process parameters
check box, and then in either or both the
Mean
and
Standard deviation
edit boxes, type the known value of the parameter.
Optional:
To show the process mean and sigma statistics, select the
Show process statistics
check box.
Optional:
To show the center and control limit statistics, select the
Show process control statistics
check box.
Click
Calculate
.
Related concepts
Uniformly Weighted Moving Average (UWMA) chart
Related tasks
Applying phases/stages for each change in a process
Formatting a control chart
Labeling control chart points
Related reference
Dataset layout
Available in Analyse-it Editions
Quality Control & Improvement edition
Ultimate edition
What is Analyse-it?
What's new?
Administrator's Guide
User's Guide
Statistical Reference Guide
Distribution
Compare groups
Compare pairs
Contingency tables
Correlation and association
Principal component analysis (PCA)
Factor analysis (FA)
Item reliability
Fit model
Method comparison / Agreement
Measurement systems analysis (MSA)
Reference interval
Diagnostic performance
Survival/Reliability
Control charts
Shewhart control charts
Time-weighted control charts
Uniformly Weighted Moving Average (UWMA) chart
Exponentially Weighted Moving Average (EWMA) chart
Creating a UWMA control chart
Creating an EWMA control chart
CUmulative SUM (CUSUM) chart
Creating a CUSUM control chart
Study design
Process capability
Pareto analysis
Study Designs
Bibliography
Version 6.15
Published 18-Apr-2023
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