CADAR QS-Pro

Home > Products > QS-Pro > Stats

QS-Pro shows the statistical results you need for both SPC and inspection plans as soon as you make measurements.  As soon as you hit the data entry button it updates it's charts, histograms and statistics windows and analyses the new data along with the old looking for trends and as well as straighforward control and tolerance violations.

Basic statistics are suitable primarily for inspection tasks - at goods inwards for example...

• Mean
• Standard Deviation
• Sigma-hat
• Max & Min
• Pp & Ppk
• Control Limits for mean, sigma, range, individuals

Process control statistics are calculated for all features configured to plot mean range or mean sigma charts...

• Cp & Cpk
• Control limit violations
• Tolerance violations
• Drifts and Runs
• Middle third testing
• Control limit calculation

You can tailor precisely what constitutes an out of control condition - individually for each process if need be. Drifts may be quite normal in a ground feature for example.

A capability study provides detailed analysis of a set of measurements and includes finding the best fit distribution shape and predictions of percentages in and out of tolerance...

• Mean
• Standard deviation
• Distribution shape
• Performance limits
• Pp & Ppk
• Tolerance projections

The last three quantities are calculated from the distribution shape and will provide a more accurate model of your process or sample than will the basic or process control statistics which, for largely historical reasons, are based on the normal distribution.