SPC - Histogram

This bar chart is an overview of the frequency of an event or observation across a set of ranges or bins. The y axis shows the frequency. The x axis shows the bins. The height of the bar in a bin indicates the frequency of the event that falls into the range.

You can set the following prompt filters in this chart:

From Date
To Date
Location
Resource
Event Type
Measurement Type
Event Code
Number of Bins: Select Number of Bins to set the number of bins to display in the chart. The value that you select from the User Selected Value list is the number of bins that appears on the x axis.
Bin Interval: Select Bin Interval to set the range for each bin. Enter the range in the User Selected Value field.
Minimum: The minimum value for the bin range limit. Use this filter to set the lowest data point to be included in the data set.
Maximum: The maximum value for the bin range limit. Use this filter to set the highest data point to be included in the data set.

The following measures are reported in the SPC Histogram chart.

Table 1. Measures in the SPC Histogram chart
Measure	Description
Frequency	Number of events that fall into a bin. The height of the bar indicates the frequency. Displayed on the y axis.
Bin Range	The bin interval. Displayed on the bins on the x axis.
Frequency of Bin Containing Mean Value	Frequency of the bin that contains the mean value of the events in the chart.
Count of Observations	Total number of events in the chart.
Mean	Mean value of the data in the chart.
Median	Median value of the data in the chart.
Minimum	Minimum value of the data in the chart.
Maximum	Maximum value of the data in the chart.
Range	The difference between the minimum and maximum values.
Standard Deviation	The standard deviation of the data in the chart.
Skewness	Indicates how symmetrical or asymmetrical the data is.
Kurtosis	Indicates if the data is peaked or flat, relative to a normal situation.
Start Date	The date of the earliest event in the chart.
End Date	The date of the latest event in the chart.

The Fitted Distribution line shows the trend in the data.

Click X Bar R/S Chart to run the SPC - X Bar R/S Chart.