n episodes ago picks the samples n episodes before the current one.
Examples
Consider the following case:
01 Jun 03 20 Jun 03 08 Oct 03 15 Oct 03 02 Nov 03 ABC 2.0-4.0 2.0 2.1 2.2 2.5 1.9* DEF 2.0-4.0 3.2 5.0* 3.5 3.9 GHI 2.0-4.0 6.0* 5.2* 2.3 2.9 5.5*
In a condition….
ABC 1 episode ago is 2.5
DEF 2 episodes ago is high
DEF 4 episodes ago is not available
In a comment….
The comment:
The value of ABC three episodes ago is {ABC 3 episodes ago}.
appears in a report as:
The value of ABC three episodes ago is 2.1.
In a calculated value….
A Calculated Value Attribute, CVA, with expression:
ABC 3 episodes ago * 2
appears in the case with these values:
01 Jun 03 20 Jun 03 08 Oct 03 15 Oct 03 02 Nov 03 ABC 2.0-4.0 2.0 2.1 2.2 2.5 1.9* CVA 4.0 4.2
Note: in CVA the episode values for ABC have effectively been shifted to the right (and doubled).