Conversely, 5 of the 56 cavers started their quit with at least 10 consecutive days of posting roll. Which means that 51 cavers couldn't make it to double digits. Maybe there's your magic number. There's a 91.07% chance of caving if you don't make it to day 10 (according to August 2011 data; recognizing that the sample size is not representative.... )
If you do not make it to day 10, by definition you would have caved (100%).
What I think this is actually showing is that if you were to cave, there is a 91% chance that you would do it in the first ten days (based on your sample)
That's probably more accurate... though I also think this illustrates that if you start posting roll from day 1, and post consecutively through day 10, you are more likely to continue with the program.
Of course, I'm not a statistician or actuary - and I know that the active quitters (39) are not included in this statistic. So it's probably actually higher than 91%. But again - the sample size isn't large enough. With so many spreadsheets out there, I'll bet someone will be industrious enough to get this math working. Happy to do my part for who ever wants to take the lead (I can't - just not smart enough :) )
The unknown is whether or not folks who stop posting pre-HOF have, in fact, caved.
Yep... and therein lies the crux of the issue that I (we) have with quantifying our success rates. Just because someone doesn't post roll that doesn't mean they're back on the can.
Which goes back to what I've often said about long term success here (hence the reason I still post daily 5+ years in): "If your name is on the line, I'm 100% sure that you're quit. If your name's NOT on the line, I have no idea."
Chewie,
I agree that there is an issue with counting this kind of data; however, there is one type of data that absolutely does mean something that has not been mentioned.
Success rate after quitters get through the 14-21 day mark.
Lets face it, most fail in the first few days. Most who will leave the site leave within the first few weeks. After the 14-21 day mark (when your brain has rewired itself) we are all in a much clearer state and have a sense of whether we want to remain here or not.
Now you would have to use the HoF 100 day mark as one mark and maybe the 30 day mark as your other. The percentages should be based off of these two numbers.
Keep these simple stats and your going to be happy.
1. Percentage of quitters who reach 30 days
2. Percentage of quitters who reach 30 days and reach HoF 100 days.
Those two percentages mean more than anything if you ask me. They at least give an indicator to go by. I would be the success rate for those who make 100 days after reaching 30 days is well over 50%... that is a good number.
The other nice thing is that since I have arrived here it looks like groups have got the whole spreadsheet thing going in a great direction. Hopefully it gets passed along to every group and numbers will start being really easy to keep track of so we can get a good estimate for what this site really does.
I have to be honest in saying this... to attract people you often need numbers. If this site does have a 15-25% success rate I do believe that would be one of the highest success rates ever in the history of tobacco cessation programs. Obviously that is a wild ass guess.