freq_eval() will evaluated how well freq_estimate performed
by calculating the precision and CV of the frequency estimates for the top
clones and by determining the proportion of the top clones whose true clonal
frequency lies in the 95-percent CI determined by freq_estimate
freq_eval(freq, number_skewed, TCR, numb_clones, prop_top)freq_estimatenumber_skewed
argument used when create_clones is called)TCR element of the output of
create_clonesskewed.