Would be useful to have a Coefficient of Correlation function (a.k.a. Pearson Coefficient of Correlation).
In Excel this function has two names: CORREL and PEARSON - but they are functionally identical.
In Qlik it's just: correl
In BigQuery it's: corr
That said, it is possible (as I have done) to derive this from basic aggregation functions, but would be useful to have this as a native function in EasyMorph.