MT4 formulas

 

Hi,

I have a system in Excel which I would like to convert to MT4 can anyone please tell me if these functions exist in MetaTrader 4 and what there names are (I have given the excel name and function below):

1) STDEV - Standard Deviation

2) COVAR- Covariant

3) CORREL - Correlation

Help would be much appreciated !

Reason: