Go to Post I've got much more out of FIRST ever since I stopped and realized I can gain so much more from trying to improve my current team's situation rather than complain about teams who have more. - AdamHeard [more]
Home
Go Back   Chief Delphi > ChiefDelphi.com Website > Extra Discussion
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
Reply
 
Thread Tools Rate Thread Display Modes
  #1   Spotlight this post!  
Unread 20-05-2016, 21:42
cbale2000's Avatar
cbale2000 cbale2000 is offline
Registered User
AKA: Chris Bale
FRC #5712 (Gray Matter)
Team Role: Mentor
 
Join Date: Apr 2006
Rookie Year: 2004
Location: Saginaw, MI
Posts: 932
cbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond repute
Re: pic: Histogram of # years active for teams that have dropped out

Quote:
Originally Posted by GeeTwo View Post
Yes. Based on the (invalid) assumption that teams don't revive, the "mortality rate" between years 1 and 2 is 13-14%. (I used the data posted in the sustainability thread.) A bit of curve fitting indicates that the mortality rate declines by about 15% of its value each year. After year 9 there's a lot of scatter in the data, but the trend still looks good.
The results I got were similar, though the averages take into account older teams which plays with the values some.
The overall trend looks about like what you're describing though:

Reply With Quote
  #2   Spotlight this post!  
Unread 23-05-2016, 11:23
GeeTwo's Avatar
GeeTwo GeeTwo is offline
Technical Director
AKA: Gus Michel II
FRC #3946 (Tiger Robotics)
Team Role: Mentor
 
Join Date: Jan 2014
Rookie Year: 2013
Location: Slidell, LA
Posts: 3,570
GeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond repute
Re: pic: Histogram of # years active for teams that have dropped out

Quote:
Originally Posted by cbale2000 View Post
The results I got were similar, though the averages take into account older teams which plays with the values some.
Quite. I began by dropping all of the teams founded prior to 2000. There are many teams which no longer exist which do not show up in TBA at all. Maize Craze was reportedly played by 28 teams, but there are only 8 teams listed as having been founded in 1992, seven of which still compete. The survival rate of 1992 teams is therefore more like 25% than 87%. Dropping 1992-1999 was a bit arbitrary, but looking at your curve, I probably should have dropped a couple more years.
__________________

If you can't find time to do it right, how are you going to find time to do it over?
If you don't pass it on, it never happened.
Robots are great, but inspiration is the reason we're here.
Friends don't let friends use master links.
Reply With Quote
  #3   Spotlight this post!  
Unread 23-05-2016, 12:45
plnyyanks's Avatar
plnyyanks plnyyanks is offline
Data wins arguments.
AKA: Phil Lopreiato
FRC #1124 (The ÜberBots), FRC #2900 (The Mighty Penguins)
Team Role: College Student
 
Join Date: Apr 2010
Rookie Year: 2010
Location: NYC/Washington, DC
Posts: 1,113
plnyyanks has a reputation beyond reputeplnyyanks has a reputation beyond reputeplnyyanks has a reputation beyond reputeplnyyanks has a reputation beyond reputeplnyyanks has a reputation beyond reputeplnyyanks has a reputation beyond reputeplnyyanks has a reputation beyond reputeplnyyanks has a reputation beyond reputeplnyyanks has a reputation beyond reputeplnyyanks has a reputation beyond reputeplnyyanks has a reputation beyond repute
Re: pic: Histogram of # years active for teams that have dropped out

Quote:
Originally Posted by GeeTwo View Post
There are many teams which no longer exist which do not show up in TBA at all. Maize Craze was reportedly played by 28 teams, but there are only 8 teams listed as having been founded in 1992, seven of which still compete.
I'm pretty sure TBA will only return teams that survived into the static team number age (teams that folded before that wouldn't have been available in the FIRST records for TBA to import, and any data that did exist wouldn't have made much sense). So the cutoff would be: all teams on TBA competed in at least the 1998 season.

I couldn't find any quick examples to dispute that, although I didn't to an exhaustive search.
__________________
Phil Lopreiato - "It's a hardware problem"
Team 1124 (2010 - 2013), Team 1418 (2014), Team 2900 (2016)
FRC Notebook The Blue Alliance for Android
Reply With Quote
  #4   Spotlight this post!  
Unread 23-05-2016, 13:13
GeeTwo's Avatar
GeeTwo GeeTwo is offline
Technical Director
AKA: Gus Michel II
FRC #3946 (Tiger Robotics)
Team Role: Mentor
 
Join Date: Jan 2014
Rookie Year: 2013
Location: Slidell, LA
Posts: 3,570
GeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond reputeGeeTwo has a reputation beyond repute
Re: pic: Histogram of # years active for teams that have dropped out

Quote:
Originally Posted by plnyyanks View Post
I'm pretty sure TBA will only return teams that survived into the static team number age (teams that folded before that wouldn't have been available in the FIRST records for TBA to import, and any data that did exist wouldn't have made much sense). So the cutoff would be: all teams on TBA competed in at least the 1998 season.

I couldn't find any quick examples to dispute that, although I didn't to an exhaustive search.
I found a few, including 98, which only shows up in 1994; TBA does not even have a name for FRC98. Match scores are only present in TBA from 2002 forward, so I speculate that any team which did not win any awards and folded before 2002 is not represented. (FRC98 won rookie all star in '94).
__________________

If you can't find time to do it right, how are you going to find time to do it over?
If you don't pass it on, it never happened.
Robots are great, but inspiration is the reason we're here.
Friends don't let friends use master links.
Reply With Quote
Reply


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 17:58.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi