How close the measurement is to the true value. Has the data been measured and recorded correctly?
Precise
How close the measurements are.
How closely do individual measurementsagree with each other?
Repeatable
Increased precision by repeating measurements in the one setting by a single investigator under the same conditions and using the same set-up over a short time scale.
Can the same investigator use the same investigation and equipment and get the same result?
Reproducible
Increased precision is achieved when measures are obtained by different investigators in different laboratories and using different equipment.
Can another investigator use the same method and get a similar result?
True Value
The range of values that would be found if the data could be measured perfectly.
