Reliability and validity are issues for all operational definitions. We want accurate and reliable observations and we want our observations to validly reflect the variable of interest. If choosing an existing coding scheme, look for good interrater reliability. Remember that the more complex the behavior that is recorded, the more difficult it is to achieve good interrater reliability. Coding schemes that have been successfully used in other studies demonstrate good construct validity. If you are developing your own measure, be sure to assess interrater reliability. At minimum, you should have good content validity.
Let's go on to our next type of study: Surveys. |
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