Formats and Calculations Unique to the p Chart
p Chart UCL Limited to 100% Since it is a Fraction Defective Chart
Since the p chart is a fraction defective chart, the UCL is limited to 100% and the LCL is limited to 0%
p Chart Calculations for Small Sample Sizes
In certain cases, the standard formulas for control limits on the p chart cannot be used. This condition exists when:
n × pbar < 5
QI Macros p chart template contains a tab for these instances: 
Why Choose QI Macros Over Other Control Chart Software?
Affordable
- Only $279 USD - less with quantity discounts
- No annual subscription fees
- Free technical support
Easy to Use
- Works right in Excel
- Create a chart in seconds
- Easy to customize & share charts
Proven and Trusted
- More than 100,000 users
- In More than 80 countries
- Five Star CNET Rating - Virus free
