In python, percentage changes, cumulative sums, std deviations can be plotted, using the following code snippet:
df=quandl.get('EURONEXT/XYZ.4')
df_changes = df.pct_change(periods=1)
df_cumsum = df_changes.cumsum()
df_filled = df.asfreq('D', method='ffill')
df_returns = df_filled.pct_change()
df_std = df_returns.window=30,minperiod=30).std()
df_changes.plot()
df_cumsum.plot()
df_std.plot()
Please guide me in doing the same thing in Julia.