Calculate RSI indicator according to tradingview?

Question

I would like to calculate RSI 14 in line with the tradingview chart.

According to there wiki this should be the solution: https://www.tradingview.com/wiki/Talk:Relative_Strength_Index_(RSI)

I implemented this is in a object called RSI: Calling within object RSI:

    self.df['rsi1'] = self.calculate_RSI_method_1(self.df, period=self.period)

Implementation of the code the calculation:

    def calculate_RSI_method_1(self, ohlc: pd.DataFrame, period: int = 14) -> pd.Series:

        delta = ohlc["close"].diff()

        ohlc['up'] = delta.copy()
        ohlc['down'] = delta.copy()

        ohlc['up'] = pd.to_numeric(ohlc['up'])
        ohlc['down'] = pd.to_numeric(ohlc['down'])

        ohlc['up'][ohlc['up'] < 0] = 0
        ohlc['down'][ohlc['down'] > 0] = 0

        # This one below is not correct, but why?
        ohlc['_gain'] = ohlc['up'].ewm(com=(period - 1), min_periods=period).mean()
        ohlc['_loss'] = ohlc['down'].abs().ewm(com=(period - 1), min_periods=period).mean()

        ohlc['RS`'] = ohlc['_gain']/ohlc['_loss']

        ohlc['rsi'] = pd.Series(100 - (100 / (1 + ohlc['RS`'])))

        self.currentvalue = round(self.df['rsi'].iloc[-1], 8)
        print (self.currentvalue)

        self.exportspreadsheetfordebugging(ohlc, 'calculate_RSI_method_1', self.symbol)

I tested several other solution like e.g but non return a good value:

https://github.com/peerchemist/finta https://gist.github.com/jmoz/1f93b264650376131ed65875782df386

Therefore I created a unittest based on : https://school.stockcharts.com/doku.php?id=technical_indicators:relative_strength_index_rsi

I created an input file: (See excel image below) and a output file: (See excel image below)

Running the unittest (unittest code not included here) should result in but is only checking the last value.

if result == 37.77295211:
    log.info("Unit test 001 - PASSED")
    return True
else:
    log.error("Unit test 001 - NOT PASSED")
    return False

But again I cannot pass the test. I checked all values by help with excel.

So now i'm a little bit lost.

If I'm following this question: Calculate RSI indicator from pandas DataFrame? But this will not give any value in the gain.

a) How should the calculation be in order to align the unittest?
b) How should the calculation be in order to align with tradingview?

score 5 · Answer 1 · edited Nov 12 '21 at 20:33

5

Here is a Python implementation of the current RSI indicator version in TradingView:

https://github.com/lukaszbinden/rsi_tradingview/blob/main/rsi.py

edited Nov 12 '21 at 20:33

Asclepius

57,944
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167
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answered Mar 15 '21 at 08:21

Lukas Z.

335
4
5

1

Yes, this works very nicely provided you run the script on a sufficiently large dataset. (You will need to provide at least 100 data points before the calculated RSI and the TradingView RSI will correlate.) Thank you for posting. – Lucas Schwartz Jun 10 '22 at 11:46

score 4 · Answer 2 · edited Nov 12 '21 at 20:33

4

I had same issue in calculating RSI and the result was different from TradingView, I have found RSI Step 2 formula described in InvestoPedia and I changed the code as below:

N = 14
close_price0 = float(klines[0][4])
gain_avg0 = loss_avg0 = close_price0
for kline in klines[1:]:
    close_price = float(kline[4])
    if close_price > close_price0:
        gain = close_price - close_price0
        loss = 0
    else:
        gain = 0
        loss = close_price0 - close_price
    close_price0 = close_price
    gain_avg = (gain_avg0 * (N - 1) + gain) / N
    loss_avg = (loss_avg0 * (N - 1) + loss) / N
    rsi = 100 - 100 / (1 + gain_avg / loss_avg)
    gain_avg0 = gain_avg
    loss_avg0 = loss_avg

N is the number of period for calculating RSI (by default = 14) the code is put in a loop to calculate all RSI values for a series.

edited Nov 12 '21 at 20:33

Asclepius

57,944
17
167
143

answered May 27 '20 at 13:09

Hamed

61
4

This is classic Wilder’s Smoothing Method and it is not the same that trading view is using. – Hamboy75 Sep 08 '21 at 16:57
https://goodcalculators.com/rsi-calculator/ here you can find wilder's method and you will see that it doesnt match with trading view rsi – Hamboy75 Sep 08 '21 at 17:01
I had the same problem - I was trying to validate Trading Views standard RSI against a C# charting tool I am creating. Using your code above, I was able to exactly reconstruct Trading Views RSI with 100% accuracy. You sir are a steely eyed missile man. – Code Warrior Nov 15 '21 at 10:43

score 2 · Answer 3 · answered Jun 15 '20 at 13:01

2

For those who are experience the same.

My raw data contained ticks where the volume is zero. Filtering this OLHCV rows will directly give the good results.

answered Jun 15 '20 at 13:01

Justme

211
2
9

Calculate RSI indicator according to tradingview?

3 Answers3

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