public static double deviations(int productId1, int productId2)
{
var data = DataParser.write2DArray("./userData.data", ",");
var filteredData = DataParser.filterTwoProducts(data, productId1, productId2);
double result = 0f;
foreach (var user in filteredData)
{
result += ((user.Value[productId1]) - (user.Value[productId2]));
}
return(result / filteredData.Count());
}
