The measurement and certification of panel consistency through a unique audit program validating online sample output over time. Using a standard questionnaire and deploying it at different intervals, Consistent Track™ measures the consistency of the survey results for each wave. Key factors like demographics, purchasing behavior segments, sociographic segments, media segments, and undesirable respondent behaviors such as speeders, professionals and satisficers, are compared to the ''Grand Mean'' (average responses for these measures). Using optimization models input panel sources are manipulated so that output is fine tuned.

Is your data measuring opinion or a change in the sampling frame?

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CPR® (Consistency, Predictability, Reliability)  

A unique tracking program that measures the consistency of sample sources to identify the real changes in data and reduce the background error that we experience. When allied with a tracking study CPR independently measures the variability caused by sample source changes helping researchers identify which changes are real.

This is a distributed value with the error ranges indicated by the vertical black lines at the end of the groups. These bounds consist of 2 standard errors based on the overall mean values. The space between represents a 95% probability interval. As would be expected, there does not appear to be a major difference between the 5/2009 sample set and the average value. However, that should be verified with the χ² test.