Индекс относительной силы

Я пытаюсь рассчитать индекс относительной силы RSI для финансового инструмента. Когда я сравниваю свой расчет с расчетом, выполненным с помощью коммерческого программного обеспечения, они не выглядят одинаково. Я не могу понять, что я делаю неправильно. Кто-нибудь может помочь?
формула RSI:

{100} - (100/(1+РС)). Где RS — это AvgGain (N периодов)/AvgLoss (N периодов)

public DataTable RSI(string instrument, int period, string oper, int entryVal)
{



 DataTable dtRSI = new DataTable();      //table to return
    dtRSI.Columns.Add("Date");
    dtRSI.Columns.Add("Instrument");
    dtRSI.Columns.Add("Close");
    dtRSI.Columns.Add("RSI");

    //Load Datatable from database
    DataTable dt = new DataTable();
    dt = conn.ExtractDataFromDb(instrument);       

    int column = 1; //Close price

    //variables to RSI formula
    Queue<float> avgUp = new Queue<float>();
    Queue<float> avgDown = new Queue<float>();
    float close1, close2, rsi, rs;
    float avgUp1, avgUp2, newAvgUp, avgDown1, avgDown2, newAvgDown;

    string[] dateCloseRsi = new string[3];      //row of data to insert into new table
    string date;                                //date of calculation
    string[] splitDate = new string[2];

    //get first close
    close1 = float.Parse(dt.Rows[0][column].ToString());
    dt.Rows.RemoveAt(0);

    //get close for number of periods into the que-list
    for (int i = 1; i <= period; i++)
    {
        close2 = float.Parse(dt.Rows[0][column].ToString());

        //are todays close higher then yesterday?
        if (close2 > close1)
        {
            avgUp.Enqueue(close2 - close1);
            avgDown.Enqueue(0);
        }
        else if (close2<close1)
        {
            avgUp.Enqueue(0);
            avgDown.Enqueue(close1 - close2);
        }
        else
        {
            avgUp.Enqueue(0);
            avgDown.Enqueue(0);
        }

        close1 = close2;

        dt.Rows.RemoveAt(0);
    }


    //iterate datatable and calculate RSI
    foreach (DataRow rows in dt.Rows)
    {

        avgUp1 = float.Parse(avgUp.Average().ToString("n2"));       //calculate yesterdays avg difference on up days
        avgDown1 = float.Parse(avgDown.Average().ToString("n2"));   //calculate yesterdays avg difference on down days
        avgUp.Dequeue();
        avgDown.Dequeue();


        close2 = float.Parse(rows[column].ToString()); //todays close 
        //close today higher then yesterday?
        if (close2 > close1)
        {
            avgUp.Enqueue(close2 - close1);
            avgDown.Enqueue(0);
        }
        else if (close2 < close1)
        {
            avgDown.Enqueue(close1 - close2);
            avgUp.Enqueue(0);
        }
        else
        {
            avgUp.Enqueue(0);
            avgDown.Enqueue(0);
        }

        avgUp2 = float.Parse(avgUp.Average().ToString("n2"));           //todays avg difference on up days
        avgDown2 = float.Parse(avgDown.Average().ToString("n2"));       //todays avg difference on down days
        newAvgUp = ((avgUp1 * (period - 1)) + avgUp2) / period;         //yesterdays and todays avg diff value on up days
        newAvgDown = ((avgDown1 * (period - 1)) + avgDown2) / period;   //yesterdays and todays avg diff value on down days
        newAvgUp = float.Parse(newAvgUp.ToString("n2"));                //round to 2 decimals
        newAvgDown = float.Parse(newAvgDown.ToString("n2"));            //round to 2 decimals


        rs = newAvgUp / newAvgDown;                 //calc Relative Strength
        rs = float.Parse(rs.ToString("n2"));        //round to 2 decimals
        rsi = 100 - (100 / (1 + rs));               //Calc RSI
        rsi = float.Parse(rsi.ToString("n2"));      //round to 2 decimals

        close1 = close2;                            //todays close become yesterdays close for tomorrow

        //remove time from date
        date = rows[0].ToString();
        splitDate = date.Split(' ');
        date = splitDate[0];


        //add data to dtRSI
        DataRow rsiRow = dtRSI.NewRow();
        rsiRow["Date"] = date;
        rsiRow["Instrument"] = instrument;
        rsiRow["Close"] = rows[column];
        rsiRow["RSI"] = rsi;
        dtRSI.Rows.Add(rsiRow);

    }
        return dtRSI;               //returns a table with Date, Instrument, Close Price and RSI

}