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    Backtesting

    Strategy help
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    • M
      magenta.kabuto @Vyacheslav_B last edited by

      @vyacheslav_b Thank you 🙂

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      • S
        stefanm @magenta.kabuto last edited by

        @magenta-kabuto Hi, maybe this can help with your strategy also:
        In your function regime_trade() before returning signals_df, convert it to pandas.Series structure, and name it to corresponding asset (e.g. "NAS: AAPL").

        series = signals_df.squeeze().rename(asset_name)
        return series
        

        After putting it to trades = dict(), you can concatenate trades.values(), which will create pandas.DataFrame of signals by assets:

        pd_signals = pd.concat(trades.values(), axis=1)
        

        Then, convert it to xarray.DataArray and pass it as weights to backtester.

        import xarray as xr
        
        xr_signals = xr.DataArray(pd_signals, dims=('time', 'asset'))
        
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        • M
          magenta.kabuto @stefanm last edited by

          @stefanm Thank you very much, that was extremely helpful. Without your help I would probably be still trying to figure out a way 👏

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            magenta.kabuto last edited by

            @magenta-kabuto Bildschirmfoto 2023-03-29 um 17.33.56.png Bildschirmfoto 2023-03-29 um 17.32.54.png
            First of all thx again for the help. Single-Pass Backtesting works fine and I am pretty happy with the result. Multiple-Pass Backtesting however returns the error shown in the screenshot. I assume that this problem occurs because load data, an xArray DataArray is passed into the function that inputs pandas. IS this right ?And if yes, can I avoid it without having to rewrite the algo or can I skip Multiple-Pass backtest as my algo doesnt look into the future? Very grateful, if anyone can help. Regards

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            • M
              magenta.kabuto @magenta.kabuto last edited by

              @magenta-kabuto And what is the exact competition name ? 😅

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              • S
                stefanm @magenta.kabuto last edited by

                @magenta-kabuto Hi, yes that's right, it seems that xarray DataArray is passed to function which expects pandas DataFrame (your entire algorithm is not visible, which is ok, so this is an assumption), but maybe you can try with this:

                ### use your regime_trade(Stockdata, param_2=0.15) as helper function
                
                
                def strategy(data):
                # param data: the data returned from load_data function, xarray.DataArray structure. 
                    Stockdata = ... # prepare data for regime_trade input, like you did for single pass
                    trades = {}
                    for j in logopenmod.keys():
                        trades[j] = regime_trade(Stockdata[j].iloc[:,3], 0.15)
                    pd_signals = pd.concat(trades.values(), axis=1)
                    xr_signals = xr.DataArray(pd_signals, dims=('time', 'asset'))
                    is_liquid = data.sel(field="is_liquid") # assume that "stocks" is exactly the same as data is
                    return xr_signals * is_liquid
                    
                

                Try it with Multi-pass, and change the name in competition_type. Set the start date as below:

                weights = qnbk.backtest(
                  competition_type = "stocks_nasdaq100",
                  load_data = load_data, # if omitted it loads data by competition_type
                  lookback_period = 365,
                  start_date = "2006-01-01", # set start_date 
                  strategy = strategy,
                  analyze = True,
                )
                

                Regards

                M 1 Reply Last reply Reply Quote 1
                • M
                  magenta.kabuto @stefanm last edited by

                  @stefanm I cant thank you enough. A very elegant way. The backtest atleast gets started but after approx. 20 seconds: the following occurs:
                  Sry for being so annoying, the conversion is an extreme blindspot to me and if it takes too much time, pls focus on your strategy instead of mineBildschirmfoto 2023-03-29 um 20.42.45.png Bildschirmfoto 2023-03-29 um 20.42.50.png

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                  • S
                    stefanm @magenta.kabuto last edited by

                    @magenta-kabuto No problem, you're welcome. Can you please change the start_date to '2006-01-01' when running backtester, and let us know if it worked?

                    M support 2 Replies Last reply Reply Quote 1
                    • M
                      magenta.kabuto @stefanm last edited by

                      @stefanm Finally worked. For whatever reason I had to write the trade library and the loop outside the strategy function, as the output was otherwise empty. (Tried all sorts of spacing to get it inside the stratety function but didnt work). Good luck with your strategy if you are taking part in the contest too! 🙂 Bildschirmfoto 2023-03-30 um 02.14.55.png

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                      • M
                        magenta.kabuto @magenta.kabuto last edited by

                        This post is deleted!
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                          magenta.kabuto @magenta.kabuto last edited by

                          This post is deleted!
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                          • support
                            support @stefanm last edited by

                            @stefanm Thank you!

                            1 Reply Last reply Reply Quote 0
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