not perfectly accurate

Mentioned in ?
References in periodicals archive ?
Psychological tests are developed and applied via scientific methods, but they are not perfectly accurate.
The Dow Jones Industrial Average--which we like to think of like a bathroom scale: not perfectly accurate but reliable enough to show the trend line--has found its way to 18,000.
Other differences come from the tests on which the value-added measures are based; because test scores are not perfectly accurate measures of student knowledge, it follows that they are not perfectly accurate gauges of teacher performance.