Disease Detectives B/C

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Re: Disease Detectives B/C

Postby Nerd_Bunny » Mon Apr 16, 2018 2:05 pm

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.
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Re: Disease Detectives B/C

Postby Killboe » Tue Apr 17, 2018 1:52 pm

Can you guys give me a simple criteria to write a case definition. It's my hardest thing to do
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Re: Disease Detectives B/C

Postby Froggie » Tue Apr 17, 2018 2:39 pm

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.
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Re: Disease Detectives B/C

Postby wzhang5460 » Tue Apr 17, 2018 3:53 pm

Does anyone have any info on the quality of the Disease test for Div B nats?
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Re: Disease Detectives B/C

Postby Killboe » Tue Apr 17, 2018 7:06 pm

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



It's hard
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Re: Disease Detectives B/C

Postby Froggie » Sat Apr 21, 2018 3:29 pm

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?
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Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » Sat Apr 21, 2018 3:42 pm

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%

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Re: Disease Detectives B/C

Postby Nerd_Bunny » Sat Apr 21, 2018 4:36 pm

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.
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Re: Disease Detectives B/C

Postby Tailsfan101 » Sat Apr 21, 2018 8:00 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.
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Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » Sat Apr 21, 2018 11:28 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 Sat Apr 21, 2018 11:59 pm, edited 1 time in total.

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Re: Disease Detectives B/C

Postby Unome » Sat Apr 21, 2018 11:33 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?)
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Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » Sat Apr 21, 2018 11:35 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.

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Re: Disease Detectives B/C

Postby Unome » Sun Apr 22, 2018 12:26 am

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.
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Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » Sun Apr 22, 2018 1:42 am

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

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Re: Disease Detectives B/C

Postby BasuSiddha23 » Mon Apr 23, 2018 9:29 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.
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