Statistical Process Control (SPC) charts are now available on the Model Health System. Just go to the top right of your interactive chart and select from the drop-down menu.
SPC is an analytical technique that plots data over time. It helps people understand variation and can guide them to take the most appropriate action.
- SPC alerts us to a situation that may be deteriorating
- SPC shows us if a situation is improving
- SPC shows us how capable a system is of delivering a standard or target
- SPC shows us if a process that we depend on is reliable and in control
An SPC chart is a time series line chart with three reference lines that help you appreciate variation in the data. In the Model Health System, the reference lines are:
- centre reference line: the mean
- upper and lower reference lines: the process limits, also known as control limits.
The limits are defined by the variability of data for the measure plotted on the chart.
A set of rules allows you to interpret SPC charts and help you understand when something unusual is happening. There are four SPC rules in MHS:
- A single point outside the control limits
- Two out of three points are within one sigma of a control limit
- Seven or more consecutive points above or below the mean line
- Seven or more consecutive points increasing or decreasing
Where a data point breaks one or more of these rules it is plotted in colour on the SPC chart.
Improvement is shown by a blue dot, deterioration is shown by an orange dot.
Regular training sessions are run by the Making Data Count team. If you're interested, find out more here: : https://future.nhs.uk/connect.ti/MDC/view?objectId=117816261
To access the Making Data Count training dates you will need to sign up to the futures site first: https://future.nhs.uk/MDC/grouphome