Is There A Trend in My Data?
A customer recently asked: How can I tell if there's really a trend in my data? He wanted to know if scans were increasing.
He had used Excel to add a trend tine to a bar chart, but wanted to know if there was a way to show control limits:
QI Macros XmR Trend Chart
Using QI Macros, you can create an XmR Trend Chart:
- In this case 0.6832 = 0.44 (a 44% fit).
- Slope is increasing by 12 scans per month.
- And the process is in control except for the range change in October.
He can count on a 12 patient increase per month.
Here's my Point: Use the QI Macros XmR Trend Chart to check your data for trends.
Trend Lines Can Lie
A trend line does not a trend make. Click here to find out why.
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Other Charts Included in QI Macros for Excel