You are going to get WAY to much variance to draw any usable conclusion from that...

RSV schedules are 11 days off: usually 4-6 days on, 2-3 off to equal 11 days off a month. You have the option of 'swapping' rsv days around, provided staffing is good. Some people like to do 6 on, 1 off, 6 on, 1 off, and then put a whole bunch of days off in a row. Me - I hate being on for more than 2 or 3 days so I generally try to swap so I have 2-3 on, 1 off, 2-3 on, 2 off, 2-3 on, 1 off etc. It's hit or miss if they approve it but more often than not I get something I want.

Hard lines for 4 day trips are usually 4 on, 3 off with weekends off going more senior. There are a fair number of 2 day back to backs and a few 3 day trip lines. Day trip lines are usually only a couple and go to the most senior non-commuters. 4 day trips can be traded with a pretty convenient trade program. Takes a few min to get used to it then it becomes you best friend ever. Great if you want specific overnights, dont want to fly with a DB captain, move your days off around so you get 6-7 off in a row, etc.