Chief Delphi - Registration 2012

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Re: Registration 2012

Quote:

Originally Posted by Mark McLeod (Post 1182874)

Here are some charts of interest.
These show how old the teams are that have dropped out each of the years from 1999 to 2012.

The number in the pie wedge is the number of teams that didn't return from the previous year, and the color of the wedge corresponds to the number of year's the team actually competed. This includes teams that may have skipped a year, but the skipped years weren't counted.

Any chance you could express the loss in percentages of the total loss that year? I'm hoping it will make a y2y comparison easier

Re: Registration 2012

See if the 2nd attachment fits what you want.

Re: Registration 2012

Thanks Mark.

So what occurred in 2000 and 2001? It looks like we have made steady improvement in retaining new teams since then, but those two years really stand out.

Re: Registration 2012

That cross-year comparison of % might be deceptive and I'm thinking about other ways to portray this kind of data. Maybe normalize % against the total number of teams each year, so losing 1% of total teams in 1999 can reasonably be compared to 1% of teams in 2012.
For instance, 1999 lost 12.7% of it's teams, while 2000 lost almost 5% fewer (7.9%) of it's teams.
P.S. I added full comparison charts that show the difference.

The "problem" with 2000 is that it had the lowest overall dropout rate of all the years charted, so the percentages are disproportional in comparison to the surrounding years. 2000 only lost 32 teams.
Most of the other years are pretty similar with less than a 1% spread in losses of total teams (7.9% - 8.8%), so the charts do generally work in comparison. The outliers, where comparison doesn't work, are 1999(12.7%), 2002(10%), and 2005(11.9%), all poor years for retaining teams.

Re: Registration 2012

Ah, OK.. Makes sense. Amazing how easily numbers can be deceiving If not interpreted correctly.