when is a parameter said to be identified

A parameter is said to be identified when the value of the parameter has been determined given certain data or a certain model. For instance, in a regression model, the model's parameters are identified when the model has been fitted to the data and the values of the coefficients (parameters) have been determined.

=-with a large enough sample, we can measure the effect as precisely as we want -with sufficient sample size, we can make a precise estimate of it