The following table lists the SAP Manufacturing Integration and Intelligence (SAP MII) statistical process control (SPC) charts and the information they display:
Chart Type | Displays |
---|---|
XBAR | The mean of the characteristic values in the subgroup. |
XBAR-MR | An XBAR chart and a moving range (MR) chart. An MR chart plots the difference between the average(mean) of the sub- group and the previous subgroup. This chart is often used with a subgroup size of one, known as an XBAR-Individual Moving Range. |
XBAR-RANGE | An XBAR chart and a range chart. A range chart plots the range of the characteristic values within the subgroup and requires a subgroup greater than one. |
XBAR-SDEV | An XBAR chart and a standard deviation chart. A standard deviation chart plots the standard deviation of the characteristic values in the subgroup and requires a subgroup greater than one. |
Exponentially weighted moving average EWMA | A weighted average of all past and current observations. |
EWMA-RANGE | An EWMA chart and a moving range chart. |
EWMA-SDEV | An EWMA chart and a standard deviation chart. |
MEDIAN | The median value for the subgroup. |
MEDIAN-RANGE | A median chart and a moving range chart. |
HISTOGRAM | The distribution of a process shown by plotting the relative frequency of an event within a process versus the possible process outcomes. |
BOX-WHISKER | The spread of data for all visible characteristics using the median set of data, the inter-quartile range, and the extreme values. Also known as a boxplot. |
P | The fraction of defective units per total units in the sample. |
NP | The number of defective units in the sample. |
C | The total number of defects in the sample. |
U | The average number of defects per unit. |
INDIVIDUALS | The Individuals chart plots each individual measurement (data collection value) in sequence, based on date and time at which it was recorded. Note Available only for i5SPCCharts from MII 15.0 SP00. End of the note. |
INDIVIDUALS-MR | Used along with individuals chart. For each individual measurement starting with the second one, the moving range is calculated and plotted. Note Available only for i5SPCCharts from MII 15.0 SP00. End of the note. |
MR | Plots the moving range for each subgroup. The moving range is the absolute difference between the average for the subgroup minus the average of the previous subgroup. For each subgroup, starting with the second one, the moving range is calculated and plotted. Note Available only for i5SPCCharts from MII 15.0 SP00. End of the note. |
Note
The chart types, Individuals, Individuals-MR, and MR are available only for i5SPCCharts from MII 15.0 SP00.
For details on calculations, see SPC Algorithms.