check the accurancy of the imputation using beagle 4.1

Question

[nour.hadjz]

Hello, to check if beagle does the imputation well, After imputing my data with Beagle 4.1, I will want to know if I have a good imputation, how to compare my data of study with my data of reference? and know the rate of imputation? and if there is a threshold ! Please thank you for helping me