def _plot_bollinger_bands(data, axes, period = 50, bandwidth = 1):
_check_int(period, raise_err = True)
_check_int(bandwidth, raise_err = True)
_check_pandas_series(data, raise_err = True)
lowr, mean, uppr = _get_bollinger_bands(data, period = period, bandwidth = bandwidth)
axes.plot(lowr, color = 'r', linestyle = '--')
axes.plot(mean, color = 'g', linestyle = '--')
axes.plot(uppr, color = 'r', linestyle = '--')
def _plot_bollinger_bands(data, axes, period = 50, bandwidth = 1):
_check_int(period, raise_err = True)
_check_int(bandwidth, raise_err = True)
_check_pandas_series(data, raise_err = True)
lowr, mean, uppr = _get_bollinger_bands(data, period = period, bandwidth = bandwidth)
axes.plot(lowr, color = 'r', linestyle = '--')
axes.plot(mean, color = 'g', linestyle = '--')
axes.plot(uppr, color = 'r', linestyle = '--')
def _get_bollinger_bands(data, period=50, bandwidth=1):
_check_int(period, raise_err=True)
_check_int(bandwidth, raise_err=True)
_check_pandas_series(data, raise_err=True)
roll = data.rolling(window=period)
std, mean = roll.std(), roll.mean()
upper = mean + bandwidth * std
lower = mean - bandwidth * std
return (lower, mean, upper)
def _get_bollinger_bands(data, period = 50, bandwidth = 1):
_check_int(period, raise_err = True)
_check_int(bandwidth, raise_err = True)
_check_pandas_series(data, raise_err = True)
roll = data.rolling(window = period)
std, mean = roll.std(), roll.mean()
upper = mean + bandwidth * std
lower = mean - bandwidth * std
return (lower, mean, upper)
def _plot_global_mean(data, axes):
_check_pandas_series(data, raise_err=True)
mean = data.mean()
axes.axhline(mean, color='b', linestyle='-.')
def _plot_global_mean(data, axes):
_check_pandas_series(data, raise_err = True)
mean = data.mean()
axes.axhline(mean, color = 'b', linestyle = '-.')
