Add data-analysis documentation

docs/data-analysis.md

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+# Analyzing bot data
+
+After performing backtests, or after running the bot for some time, it will be interresting to analyze the results your bot generated.
+
+A good way for this is using Jupyter (notebook or lab) - which provides an interactive environment to analyze the data.
+
+The following helpers will help you loading the data into Pandas DataFrames, and may also give you some starting points in analyzing the results.
+
+## Backtesting
+
+To analyze your backtest results, you can [export the trades](#exporting-trades-to-file).
+You can then load the trades to perform further analysis.
+
+A good way for this is using Jupyter (notebook or lab) - which provides an interactive environment to analyze the data.
+
+Freqtrade provides an easy to load the backtest results, which is `load_backtest_data` - and takes a path to the backtest-results file.
+
+``` python
+from freqtrade.data.btanalysis import load_backtest_data
+df = load_backtest_data("user_data/backtest-result.json")
+
+# Show value-counts per pair
+df.groupby("pair")["sell_reason"].value_counts()
+
+```
+
+This will allow you to drill deeper into your backtest results, and perform analysis which would make the regular backtest-output unreadable.
+
+If you have some ideas for interesting / helpful backtest data analysis ideas, please submit a PR so the community can benefit from it.
+
+## Live data
+
+To analyze the trades your bot generated, you can load them to a DataFrame as follwos:
+
+``` python
+from freqtrade.data.btanalysis import load_trades_from_db
+
+df = load_trades_from_db("sqlite:///tradesv3.sqlite")
+
+df.groupby("pair")["sell_reason"].value_counts()
+
+```
+
+Feel free to submit an issue or Pull Request if you would like to share ideas on how to best analyze the data.