Precision

In statistics, the magnitude of the standard error or the associated confidence limits of a statistical estimate such as a mean or a correlation.  When the standard error is small, estimates from different samples will be in close agreement, with the opposite also being the case.  A distinction is made between prediction and accuracy.  In this instance, it is between the reliability and reproducibility (precision) of measurement and how well it approximates a true value.  The two measures are not necessarily exclusive as a measurement can be both precise and accurate.  Such a contrast is more often referred to as ‘bias’ (accuracy) and ‘variability’ (prediction).      

See Effect size, Indices of efficacy, Influence efficacy, Odds ratio, Prediction and explanation