Disease Detectives B/C

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Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » April 24th, 2018, 2:21 pm

Explain the difference between retrospective cohort and case control studies. Can cohort studies be prospective? Can case control studies be prospective?

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Re: Disease Detectives B/C

Postby Killboe » April 25th, 2018, 6:57 am

Explain the difference between retrospective cohort and case control studies. Can cohort studies be prospective? Can case control studies be prospective?

Cohort studies can be prospective Case-control cannot be prospective. They can only be retrospective.
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Re: Disease Detectives B/C

Postby IcsTam » April 25th, 2018, 7:05 am

Explain the difference between retrospective cohort and case control studies. Can cohort studies be prospective? Can case control studies be prospective?

Cohort studies can be prospective Case-control cannot be prospective. They can only be retrospective.
Also, the difference between them is that retrospective cohort is enrolled based on exposure while retrospective case-control is enrolled based on disease status (which obviously cannot be prospective because we wouldn't know disease status beforehand.)
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Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » April 25th, 2018, 1:00 pm

Explain the difference between retrospective cohort and case control studies. Can cohort studies be prospective? Can case control studies be prospective?

Cohort studies can be prospective Case-control cannot be prospective. They can only be retrospective.
Also, the difference between them is that retrospective cohort is enrolled based on exposure while retrospective case-control is enrolled based on disease status (which obviously cannot be prospective because we wouldn't know disease status beforehand.)
Actually, case-control studies can be prospective. IcsTam, you can go

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Re: Disease Detectives B/C

Postby IcsTam » April 25th, 2018, 8:25 pm

Given a 2x2 table, how would you calculate the standard deviation? (qualitative explanation, although if using numbers as an example would help you, then feel free to)
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Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » April 26th, 2018, 12:03 pm

Given a 2x2 table, how would you calculate the standard deviation? (qualitative explanation, although if using numbers as an example would help you, then feel free to)
Standard deviation of what? A 2x2 table measures categorical data.

(If you mean the sampling distribution of proportions, you can calculate the std dev. of the sampling distribution with or if a proportion is not given.)

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Re: Disease Detectives B/C

Postby IcsTam » April 26th, 2018, 1:29 pm

Given a 2x2 table, how would you calculate the standard deviation? (qualitative explanation, although if using numbers as an example would help you, then feel free to)
Standard deviation of what? A 2x2 table measures categorical data.

(If you mean the sampling distribution of proportions, you can calculate the std dev. of the sampling distribution with or if a proportion is not given.)
Oh shoot, I messed up the question, my bad. That's pretty much what I meant. Go for it
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Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » April 26th, 2018, 1:41 pm

What are the different types of carriers?

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Re: Disease Detectives B/C

Postby Tailsfan101 » April 26th, 2018, 4:05 pm

What are the different types of carriers?
Active Carrier - A person who can transmit a disease to others but shows no signs or symptoms
Convalescent Carrier - A person who recently recovered from a disease but can still transmit the disease to others
There may be others but that's all I know.
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Re: Disease Detectives B/C

Postby UTF-8 U+6211 U+662F » April 26th, 2018, 5:03 pm

What are the different types of carriers?
Active Carrier - A person who can transmit a disease to others but shows no signs or symptoms
Convalescent Carrier - A person who recently recovered from a disease but can still transmit the disease to others
There may be others but that's all I know.
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