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Final Report for First-Round Usability Testing of Data-Reliability Indicator Prototypes

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Final Report for First-Round Usability Testing of Data-Reliability Indicator Prototypes

Written by:
SSM2009-01

Executive Summary

Final Report for First-Round Usability Testing of Data-Reliability Indicator Prototypes
Download Final Report for First-Round Usability Testing of Data-Reliability Indicator Prototypes [PDF - 1.8 MB]

All American Community Survey (ACS) estimates are currently released with their associated margin of error (MOE). However, many users do not think that the MOE provides enough information about an estimate’s reliability. We conducted usability testing to examine whether the addition of reliability indicators to new prototypes of ACS data tables helped people use the tables with greater accuracy, efficiency, and satisfaction. All three prototypical reliability indicators were based on the coefficient of variation (CV), which is defined as the standard error divided by the mean of the estimate.

Each prototypical table with a reliability indicator tested in this study implemented a color-coded “Reliability” column and a legend explaining the meaning of the color codes to provide users with guidance as to whether the proportion of error to the estimate itself might be considered unacceptably high.

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