def export_growth(data, year, A, B):
if not is_there_a_strong_tie_method_B(data, year, A, B,
strong_tie_def_args(config.STRONG_TIES_LOWER_BOUND,
config.STRONG_TIES_UPPER_BOUND)):
return CANT_ESTABLISH_TREND
actual_export_percentage = data.export_data_as_percentage(year, A, B, True)
if actual_export_percentage is None:
return CANT_ESTABLISH_TREND
(slope, lower_limit, upper_limit) = data.bollinger_band_range(year - args['sliding_window_size'] - 1, year - 1,
A, B)
if lower_limit is None or upper_limit is None:
return CANT_ESTABLISH_TREND
elif actual_export_percentage < lower_limit:
return DECELERATING
elif actual_export_percentage > upper_limit:
return ACCELERATING
else:
return STEADY_RISING if slope > 0 else STEADY_FALLING
def definition_A(data, year, country_A, country_B, args):
return POSITIVE_LINK if is_there_a_strong_tie_method_B(data, year, country_A, country_B, args) else NEGATIVE_LINK
