Conditional Lookup in Excel

Posted by Keyslinger on Super User See other posts from Super User or by Keyslinger
Published on 2010-05-25T23:50:50Z Indexed on 2010/05/26 0:03 UTC
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excel

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I want to use excel to compare pairs of numbers from the "Pre/Post" column of the following data:

Student       Course          Pre/Post    Score
K300997203  FHS120100417    Pre         3
L286197217  FHS120100417    Pre         5
S106497203  FHS120100417    Pre         4
K300997203  FHS120100417    Post        4
L286197217  FHS120100417    Post        4
S106497203  FHS120100417    Post        4
S106497203  FHS220100424    Pre         4

Specifically, I want a cell to contain the difference of the value in the "Score" column where "Pre" and "Post" appear, respectively, in rows with the same value in the "Student" and "Course" columns.

For example, Student K300997203 has a row containing Course FHS120100417, a score of 3, and "Pre"

AND

Student K300997203 has a row containing Course FHS120100417, a score of 4, and "Post".

How can I calculate a cell value as the score in the row containing "Post" minus the score in the row containing "Pre"?

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