#Earnings $IRBT reports tonight. Below are details on earnings one-day moves over the last 12 quarters.

July 23, 2019 AC -16.86%
April 23, 2019 AC -23.09%
Feb. 6, 2019 AC +9.63%
Oct. 23, 2018 AC -12.33%
July 24, 2018 AC +16.99%
April 24, 2018 AC -3.41%
Feb. 7, 2018 AC -32.07% Biggest DOWN
Oct. 24, 2017 AC -13.48%
July 25, 2017 AC +21.14% Biggest UP
April 25, 2017 AC +15.73%
Feb. 8, 2017 AC -12.93%
Oct. 25, 2016 AC +11.35%

Avg (+ or -) 15.75%
Bias -3.28%%, negative bias on earnings.

With stock at 55.00 the data suggests these ranges:
Based on current IV (expected move into Friday per TOS): 46.28 to 63.72
Based on AVERAGE one-day move over last 12 quarters: 46.34 to 63.66
Based on MAXIMUM one-day move over last 12 Q’s (32.1%): 37.36 to 72.64
Based on UP max only (+21.1%): 66.63

Open to requests for other symbols.