def average_true_range_percent(close_data, period):
catch_errors.check_for_period_error(close_data, period)<EOL>atrp = (atr(close_data, period) / np.array(close_data)) * <NUM_LIT:100><EOL>return atrp<EOL>
Average True Range Percent.

Formula:
ATRP = (ATR / CLOSE) * 100