stats.xbar(data, sizes)
sd.xbar(data, sizes, std.dev = c("UWAVE-R", "UWAVE-SD", "MVLUE-R", "MVLUE-SD", "RMSDF"))
limits.xbar(center, std.dev, sizes, conf)sd.xbar function, required for limits.xbar. See details.conf > 1) or the confidence level (if 0 < conf < 1).stats.xbar returns a list with components statistics and center.The function sd.xbar returns std.dev the standard deviation of the statistic charted. This is based on results from Burr (1969).The function limits.xbar returns a matrix with lower and upper control limits.
| Method |
| Description |
"UWAVE-R" |
| UnWeighted AVErage of subgroup estimates |
| based on subgroup Ranges |
"UWAVE-SD" |
| UnWeighted AVErage of subgroup estimates |
| based on subgroup Standard Deviations |
"MVLUE-R" |
| Minimum Variance Linear Unbiased Estimator |
| computed as a weighted average of subgroups |
| estimates based on subgroup Ranges |
"MVLUE-SD" |
| Minimum Variance Linear Unbiased Estimator |
| computed as a weighted average of subgroup |
| estimates based on subgroup Standard Deviations |
"RMSDF" |
| Root-Mean-Square estimator computed as a weighted average of |
| Method | "xbar" |
"R" |
"S" |
"UWAVE-R" |
default |
| default | not available |
"UWAVE-SD" |
| not available | default | |
"MVLUE-R" |
||
| not available |
"MVLUE-SD" |
|
| not available | Method |
Detailed definitions of formulae implemented are available in the SAS/QC 9.2 User's Guide.
qcc