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If I take a subtest from an existing neuropsychological test, and take out 5 items to use independently as my methods of measurement for each level of my within-subjects factor, how can I ensure good validity and reliability? I intend using one of the items as a 'control' score, as normal, and the other 4 will be manipulated.

  1. Look for good internal consistency to begin with between the items?
  2. When manipulating each item, control for the change through the use of the unchanged item?

Suggestions welcome!

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