Disease Detectives B/C

User avatar
Nerd_Bunny
Member
Member
Posts: 137
Joined: January 12th, 2017, 9:36 am
Division: C
State: ID
Location: 221B Baker Street
Contact:

Re: Disease Detectives B/C

Postby Nerd_Bunny » April 16th, 2018, 7:05 am

Froggie wrote:
UTF-8 U+6211 U+662F wrote:Is it just me or does every test have a matching section on the same fourteen or so terms

I’ve seen this a lot, it’s usually epidemic-endemic-pandemic-otherstuff. (There was this one test with a matching section about 30 questions long. It took a long time.)

At the NEBO invitational our test had about 100 terms :shock: that we had to define and provide examples for. I only got to 50 of them (each worth just one point) when I realized it would be better to help my partner with the rest of the test.
Events: Chemistry Lab, A&P, Disease Detectives
2017 Placings
States/Nationals
RFTS: 1/37
DD: 1/16
A&P:1/31
Ecology: -/59 haha I bet you can guess what happened here...

2018 Placings
NEBO/States/Nationals
A&P: 1/1/
Chem Lab: 5/1/
DD: 1/1/

If you're curious...yes, I like rabbits.

Killboe
Member
Member
Posts: 82
Joined: January 29th, 2018, 7:04 am
Division: B
State: FL
Location: On a mysterious planet
Contact:

Re: Disease Detectives B/C

Postby Killboe » April 17th, 2018, 6:52 am

Can you guys give me a simple criteria to write a case definition. It's my hardest thing to do
2019 River City Science Academy
2019 Events

Disease Detectives
Solar System
Density Lab

Total Awards: 6

2nd year doing Scioly
2018 Results
I/R/S/N
Disease Detectives 1/1/1/44 :(
Battery Buggy 1/1/6/54 oof

Froggie
Member
Member
Posts: 266
Joined: June 19th, 2017, 2:12 pm
Division: B
State: PA
Location: See above.
Contact:

Re: Disease Detectives B/C

Postby Froggie » April 17th, 2018, 7:39 am

Killboe wrote:Can you guys give me a simple criteria to write a case definition. It's my hardest thing to do

If you just put down some info for person, place, time, and clinical, you should get full points.
"A lot of people have quotes in their signature. Maybe I should have a quote in my signature. "
- Froggie

wzhang5460
Member
Member
Posts: 52
Joined: April 29th, 2017, 3:53 pm
Division: B
State: NY
Contact:

Re: Disease Detectives B/C

Postby wzhang5460 » April 17th, 2018, 8:53 am

Does anyone have any info on the quality of the Disease test for Div B nats?
PJ Gelinas Jr High
National Medals
Wind Power 2017: 5th
National Honorable Mentions
Exp. Design 2017, 2018: 10th
Towers 2018: 10th
Mystery Arch. 2018: 7th RIP why

Killboe
Member
Member
Posts: 82
Joined: January 29th, 2018, 7:04 am
Division: B
State: FL
Location: On a mysterious planet
Contact:

Re: Disease Detectives B/C

Postby Killboe » April 17th, 2018, 12:06 pm

wzhang5460 wrote:Does anyone have any info on the quality of the Disease test for Div B nats?



It's hard
2019 River City Science Academy
2019 Events

Disease Detectives
Solar System
Density Lab

Total Awards: 6

2nd year doing Scioly
2018 Results
I/R/S/N
Disease Detectives 1/1/1/44 :(
Battery Buggy 1/1/6/54 oof

Froggie
Member
Member
Posts: 266
Joined: June 19th, 2017, 2:12 pm
Division: B
State: PA
Location: See above.
Contact:

Re: Disease Detectives B/C

Postby Froggie » April 21st, 2018, 8:29 am

Asking questions a week before states yay
1). Should attack rate be in a percentage form? Should relative risk be in percentage form? Should odds ratio be in percentage form?
2). This was a question on a test: Number ill and exposed = 51, Number not ill and exposed = 34, Number ill and not exposed = 2, number not ill and not exposed = 13. The answer sheet says that the attributable risk is 46.67%, but I keep getting 362%. Can someone explain?
"A lot of people have quotes in their signature. Maybe I should have a quote in my signature. "
- Froggie

User avatar
UTF-8 U+6211 U+662F
Exalted Member
Exalted Member
Posts: 970
Joined: January 18th, 2015, 7:42 am
Division: C
State: PA
Location: (0, 0)
Contact:

Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » April 21st, 2018, 8:42 am

Froggie wrote:Asking questions a week before states yay
1). Should attack rate be in a percentage form? Should relative risk be in percentage form? Should odds ratio be in percentage form?
2). This was a question on a test: Number ill and exposed = 51, Number not ill and exposed = 34, Number ill and not exposed = 2, number not ill and not exposed = 13. The answer sheet says that the attributable risk is 46.67%, but I keep getting 362%. Can someone explain?

1) AFAIK it doesn't matter, but I would just use numbers.
2) (51/85) - (2/15) = 0.4667 = 46.67%

User avatar
Nerd_Bunny
Member
Member
Posts: 137
Joined: January 12th, 2017, 9:36 am
Division: C
State: ID
Location: 221B Baker Street
Contact:

Re: Disease Detectives B/C

Postby Nerd_Bunny » April 21st, 2018, 9:36 am

wzhang5460 wrote:Does anyone have any info on the quality of the Disease test for Div B nats?

Last year the test was very long and very thorough. There weren't as many calculations as we expected there to be, but it was a very good test with two good-sized cases. They gave you all the information you needed, then asked you questions about it. All of them followed the rules, as far as I could tell, so we were really pleased with the quality of the test. I don't know about this year's test- I'm unsure if the proctor was from Wright State or will be also writing the test for this year.
Events: Chemistry Lab, A&P, Disease Detectives
2017 Placings
States/Nationals
RFTS: 1/37
DD: 1/16
A&P:1/31
Ecology: -/59 haha I bet you can guess what happened here...

2018 Placings
NEBO/States/Nationals
A&P: 1/1/
Chem Lab: 5/1/
DD: 1/1/

If you're curious...yes, I like rabbits.

User avatar
Tailsfan101
Exalted Member
Exalted Member
Posts: 531
Joined: April 14th, 2017, 4:33 pm
Division: B
State: ID
Location: Somewhere off studying
Contact:

Re: Disease Detectives B/C

Postby Tailsfan101 » April 21st, 2018, 1:00 pm

Froggie wrote:1). Should attack rate be in a percentage form? Should relative risk be in percentage form? Should odds ratio be in percentage form?

As far as I know, attack rate should be in percentage form, while relative risk and odds ratio should not.
2018 Treasure Valley Homeschool Wiki (Division B)
2018
State/Nats
Crime: 1/35
Road: 1/44
DD: 2/37
MM: 3/46

2017
State/Nats
DD: 1/16
DP: -/50
Road: 2/51
FF: 4/59

2019 events: Road Scholar, Crime Busters, Disease Detectives, Heredity
Assassinator for game #118

User avatar
UTF-8 U+6211 U+662F
Exalted Member
Exalted Member
Posts: 970
Joined: January 18th, 2015, 7:42 am
Division: C
State: PA
Location: (0, 0)
Contact:

Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » April 21st, 2018, 4:28 pm

Since the tables are 2x2 anyway, why not just do a 2-proportion z-test instead of a chi-squared test of homogenity?
Last edited by UTF-8 U+6211 U+662F on April 21st, 2018, 4:59 pm, edited 1 time in total.

User avatar
Unome
Moderator
Moderator
Posts: 3564
Joined: January 26th, 2014, 12:48 pm
Division: Grad
State: GA
Location: somewhere in the sciolyverse
Contact:

Re: Disease Detectives B/C

Postby Unome » April 21st, 2018, 4:33 pm

UTF-8 U+6211 U+662F wrote:Since the tables are 2x2 anyway, why not just do a 2-proportion z-test instead of a chi-squared test of homogenity?

Pretty sure a z-test wouldn't work because of how the individuals are assigned to categories (e.g. what would your standard deviation be?)
Userpage
Chattahoochee High School Class of 2018
Georgia Tech Class of 2022

Opinions expressed on this site are not official; the only place for official rules changes and FAQs is soinc.org.

User avatar
UTF-8 U+6211 U+662F
Exalted Member
Exalted Member
Posts: 970
Joined: January 18th, 2015, 7:42 am
Division: C
State: PA
Location: (0, 0)
Contact:

Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » April 21st, 2018, 4:35 pm

Unome wrote:
UTF-8 U+6211 U+662F wrote:Since the tables are 2x2 anyway, why not just do a 2-proportion z-test instead of a chi-squared test of homogenity?

Pretty sure a z-test wouldn't work because of how the individuals are assigned to categories (e.g. what would your standard deviation be?)


(is not equal to or greater than or less than, depending on the question)



Not sure if pooling the proportions is absolutely necessary.

User avatar
Unome
Moderator
Moderator
Posts: 3564
Joined: January 26th, 2014, 12:48 pm
Division: Grad
State: GA
Location: somewhere in the sciolyverse
Contact:

Re: Disease Detectives B/C

Postby Unome » April 21st, 2018, 5:26 pm

UTF-8 U+6211 U+662F wrote:
Unome wrote:
UTF-8 U+6211 U+662F wrote:Since the tables are 2x2 anyway, why not just do a 2-proportion z-test instead of a chi-squared test of homogenity?

Pretty sure a z-test wouldn't work because of how the individuals are assigned to categories (e.g. what would your standard deviation be?)


(is not equal to or greater than or less than, depending on the question)



Not sure if pooling the proportions is absolutely necessary.

Ok, per internet research z^2 = chi-squared, which is interesting.
Userpage
Chattahoochee High School Class of 2018
Georgia Tech Class of 2022

Opinions expressed on this site are not official; the only place for official rules changes and FAQs is soinc.org.

User avatar
UTF-8 U+6211 U+662F
Exalted Member
Exalted Member
Posts: 970
Joined: January 18th, 2015, 7:42 am
Division: C
State: PA
Location: (0, 0)
Contact:

Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » April 21st, 2018, 6:42 pm

But with a two-proportion z-test, you get the freedom of doing one-tailed tests ;)

BasuSiddha23
Member
Member
Posts: 29
Joined: March 29th, 2017, 2:48 pm
Division: B
State: PA
Location: Bollywood
Contact:

Re: Disease Detectives B/C

Postby BasuSiddha23 » April 23rd, 2018, 2:29 pm

UTF-8 U+6211 U+662F wrote:
Froggie wrote:Asking questions a week before states yay
1). Should attack rate be in a percentage form? Should relative risk be in percentage form? Should odds ratio be in percentage form?
2). This was a question on a test: Number ill and exposed = 51, Number not ill and exposed = 34, Number ill and not exposed = 2, number not ill and not exposed = 13. The answer sheet says that the attributable risk is 46.67%, but I keep getting 362%. Can someone explain?

1) AFAIK it doesn't matter, but I would just use numbers.
2) (51/85) - (2/15) = 0.4667 = 46.67%


I'm certain that attack rate is a percentage. As for odds ratio and relative risk, they are shown as decimal numbers as a ratio to 1. For example, an odds ratio or relative risk could be 43 as in 43 to 1.
2017 (Rustin, Little Tiger, Regionals, States)
Wind Power (-/3/1/2) Road Scholar (10/-/2/4) Bottle Rockets (6/-/1/3)
2018 (Rustin, Little Tiger, Regionals)
Thermodynamics (5/2/1/3) Road Scholar (6/3/1/2) Hovercraft (-/6/5) Disease Detectives (-/-/2/-)


Return to “2018 Study Events”

Who is online

Users browsing this forum: No registered users and 0 guests