Quality and Reliability Methods - SAS

172 Variability Charts Chapter 10
Attribute Gauge Charts
The first plot in Figure 10.19 uses all X (Grouping) variables on the x-axis. The second plot contains all Y
variables on the x-axis (typically the rater). For the top plot,
%Agreement for subject j =
For the bottom plot in Figure 10.19,
n
number of uncounted matching levels
for this rater k within part i for rep j
i = 1j = 1
%Agreement for rater k = -------------------------------------------------------------------------------------------------------------------
n r
i
N i
– j
i = 1j = 1
where
n = number of subjects (grouping variables)
r i = number of reps for subject i (i = 1,...,n)
m = number of raters
k = number of levels
N i = m x r i . Number of ratings on subject i (i = 1,...,n). This includes responses for all raters, and repeat
ratings on a part. For example, if subject i is measured 3 times by each of 2 raters, then N i is 3 x 2 = 6.
Figure 10.19 Agreement Percentage Plots
k
number of responses for level i
2
---------------------------------------------------------------------------------------
i = 1
N
i
2
r i