Z-Score Calculation - library for MetaTrader 4

The include file named Z_include.mqh contains a function that calculates the following parameters on the data array:

• Max - the maximum value;
• Min - the minimum value;
• universal mean - the mean value;
• standard deviation - mean-squared deviation (unbiased estimate);
• skew;
• kurtosis;
• Z-score on the data array.

You can find the description of the term of Z-score in the article Mathematics in Trading: How to Estimate Trade Results

An exemplary script that calculates Z-score on a trading account:

//+------------------------------------------------------------------+
//|                                                        Get_Z.mq4 |
//|                      Copyright © 2007, MetaQuotes Software Corp. |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2007, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net"
 
#include <Z_include.mqh>
//+------------------------------------------------------------------+
//| script program start function                                    |
//+------------------------------------------------------------------+
int start()
  {
//----
   Print("Z-score of trades made on account ",AccountNumber()," is equal to ",DoubleToStr(getZ(),2));   
//----
   return(0);
  }
//+------------------------------------------------------------------+

The header file, NormalProbability.mq4, contains an example of normal probability using the array.