QWXL 3 performs 100 separate statisical calculations on your data, and displays the results in the Statistics Box. These results can also be copied to the Windows clipboard and pasted into Excel®, Microsoft Word, or any other program.
| Statistic |
Abbrev. |
Explanation |
| Number of Points |
N |
The number of non-null values found in the data selected. |
| Target Deviation |
T-Dev |
The separation between the average and the Target
value of the variable. |
| Standard Deviation - Population |
SD-Pop |
The square root of the average of the squared distances of the observations from the mean. |
| Standard Deviation - Low |
SD-Low |
The lowest segmented SD over a given range of data values. |
| Standard Deviation - Moving Range |
SD-MR |
Average Range of all points * 1.128 |
| Maximum |
Max |
The greatest value of the selected data. |
| Average +4S |
X+4S |
Average of all data points plus 4 X the selected SD method |
| Average +3S |
X+3S |
Average of all data points plus 3 X the selected SD method |
| Average |
X |
The mathematical average of all data points selected. |
| Average -3S |
X-3S |
Average of all data points less 3 X the selected SD method |
| Average -4S |
X-4S |
Average of all data points less 4 X the selected SD method |
| Minimum |
Min |
The lowest value of the selected data.
|
| Average Moving Range |
Avg-MR |
Average of range between all data points. |
| Median |
Med |
The middle value of the data set, once numerically sorted. |
| Observed % |
O%OSL |
The percentage of points outside of fixed spec limits. |
| Observed PPM |
OppmOSL |
The number of points outside of fixed spec limits, expressed in parts per million. |
| Calculated % |
C%OSL |
The percentage of points outside of +/- 4SD under the normal curve. |
| Calculated PPM O.O.L |
CppmOSL |
The number of points outside of +/- 4SD under the normal curve, expressed in parts per million. |
| Variation |
Cr |
The capability ratio describes the size of the process variability relative to the size of the specification range. |
| Targeting |
Tz |
This is determined by dividing the standard deviation into the Target Deviation. This produces a number that measures how well the process is centered on target in standard deviations. |
| Clearance |
Cpk |
Capability Clearance describes the clearance between the process distribution curve and the specification limits in terms of standard deviation. |
| Coefficient Variation |
%CV |
SD divided by average - used to normalize SD so it can be compared to other variables. |
