Selectivity is the quality of a response that can be achieved without interference for any other substance. Sensitivity is how low can you detect the substance of interest. The best analytical method offers the highest sensitivity and highest selectivity. It is desirable to have both properties as high as possible; it depends on the circumstances of the analysis if one of the properties can be sacrificed for the other.

Dear Karim,

If the question deals with predictive classification models.

https://en.wikipedia.org/wiki/Sensitivity_and_specificity

Ludovic.

Thank you all.

selectivity, how the methods detection gave response without interference, sensitivity, mean the lowest concentration that the methods of detection gave response either accurate or not accurate.

There is a good explanation is Analytical Chemistry by Skoog. You may have a look on it.

Valuable question.

Following to learn.