FAQs

When and how do I tap into the power of automatically incrementing my attribute count?

Attribute count refers to the number of times an attribute passes or fails in a lot. By using WinSPC’s Increment Attribute Pass Count or Increment Attribute Fail Count trigger, you can automatically increment an attribute count—an easy and efficient thing to do.

When do I automatically increment my attribute count?

Whenever you need to count the number of times a limit is broken by a sample in a subgroup, that counting can be automated. An example of this is the need to track the number of filled bottles that fall under an acceptable weight.

How do I automatically increment my attribute count?

1. Create the variable for which you’re going to count the number of times a limit is violated (e.g. Fill Weight).
2. Create an attribute for the number of times the limit is violated (e.g. Underweight Count). Configure this attribute to be of the Defective Units type and have a fixed lot size that is equal to the subgroup size of the variable from 1 above.
3. Create a user-defined sample level test that specifies the limit which, if violated, must result in the attribute count being incremented (e.g. Minimum Fill Weight). To do this:
   
   a. In the Administrator window, click the New Sample Level Test tool bar button.
   
   b. In the text box for the new test that appears…
   
   c. Double-click the new test.
   
   d. In the Calculation Text pane of the Equation Builder that appears, following Violation =, enter Self followed by the appropriate operator (e.g. <, >, <=, >=) followed by the limit.
   
   
   
   e. Click OK.


4. Add the variable from 1 above and the attribute from 2 to a collection plan. (The collection plan may be new or existing.)
5. Apply the custom sample level test from 3 above to the collection plan step for the variable, assign the Increment Attribute Pass Count or Increment Attribute Fail Count trigger to this test and configure this trigger to affect the attribute. (Note: Use the Increment Attribute Pass Count trigger if you want to count the number of times the limit isn’t violated and use the Increment Attribute Fail Count if you want to count the number of times the limit is violated.) To do this: a. On the Step Options tab of the Collection Plan dialog box, single-click the collection plan step for the variable.
   
   
   
   b. Click the Characteristic Tests button.
   
   c. In the Test Selection dialog box that appears, under Sample Level Tests double-click the User Defined folder.
   
   
   
   d. From the list of tests that get exposed, single-click the user-defined test you created in 3 above.
   
   e. Click the Add Trigger button.
   
   f. In the Trigger Setup dialog box that is displayed, at Trigger Type select either Increment Attribute Pass Count or Increment Attribute Fail Count.
   
   
   
   g. From the Affected Attribute list, select the attribute from 2 above.
   
   
   
   h. Click OK.
   i. Click OK in the Test Selection dialog box.
   j. Click OK in the Collection Plan dialog box.