The guiding principle for tracker studies is “on no account make any change.” This is to ensure that any change in the data wave-on-wave is a change to measures being examined and not caused by any change in project execution. Yet, there comes a time for most tracker studies when something must change.
In the second piece of content from our Research Science Center Tracker curriculum, we review three types of change that can arise when executing a tracker; changes to sample, the questionnaire, or project fielding necessitated by business requirements. However counterintuitive it may seem, find out why sample must change over time to keep results consistent.
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