Disease Detectives B/C

[UTF-8 U+6211 U+662F]

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

[Killboe]

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.

[IcsTam]

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.)

[UTF-8 U+6211 U+662F]

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

[IcsTam]

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)

[UTF-8 U+6211 U+662F]

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.)

[IcsTam]

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

[UTF-8 U+6211 U+662F]

What are the different types of carriers?

[Tailsfan101]

What are the different types of carriers?

I think (Click to Show Hidden Text)

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.

[UTF-8 U+6211 U+662F]

What are the different types of carriers?

I think (Click to Show Hidden Text)

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.

Sure - your turn