Low CUSUM use the inverted sign (always positive) (Q793)

The information in this article applies to: 
SIMCA-online 13.2
Symptoms: 

When using the CUSUM filter for a continuous configuration the Low CUSUM series is incorrectly displayed using positive values.

The correct way of displaying the Low CUSUM data is with a negative sign as in SIMCA and SIMCA-4000.

Resolution: 

Fixed in SIMCA-online 13.3.

More Information: 

Low CUSUM is a limit in the CUSUM control chart which should always be negative. However, in the products listed above, the displayed Low CUSUM is displayed with inverted sign and thus always positive.

Date modified: May 09, 2014
Article type: 
Problem