AC: Add tick model method
AC: Add tick model method

SpotlightUK/TrackerTracker,fstehle/TrackerTracker,paperlesspost/TrackerTracker,artsy/TrackerTracker,paperlesspost/TrackerTracker,SpotlightUK/TrackerTracker,fstehle/TrackerTracker,paperlesspost/TrackerTracker,fstehle/TrackerTracker,SpotlightUK/TrackerTracker