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  #1  
Old 10-21-2009
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Question Biostast Questions?

1- What is the difference between Detection and Ascertainment bias?
2- What is the difference between longitudinal and prospective studies?

Last edited by LiaBranca; 10-21-2009 at 05:11 PM.
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  #2  
Old 10-21-2009
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1- Detection bias is just like measurement bias in which your focus erronously points to a statistical difference while in fact it should not. Ascertainment bias is the specific detection bias of having the experimenter giving undue efforts to find an effects that he expects to happen.

2- Longitudinal studies follow a group of people who have certain risk or disease and see what happens with them over time. while prospective studies applies an intervention such as adding a risk or treatment and then see what happens over time.
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  #3  
Old 10-23-2009
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Quote:
Originally Posted by Ahmed-USMLE View Post
1- Detection bias is just like measurement bias in which your focus erronously points to a statistical difference while in fact it should not. Ascertainment bias is the specific detection bias of having the experimenter giving undue efforts to find an effects that he expects to happen.

2- Longitudinal studies follow a group of people who have certain risk or disease and see what happens with them over time. while prospective studies applies an intervention such as adding a risk or treatment and then see what happens over time.
Do they asked you directly on the USMLE what is the difference between this and that study and what books do you recommend i use for Bio statistics really need to know for a long time now
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Old 10-23-2009
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Quote:
Originally Posted by jessp687 View Post
Do they asked you directly on the USMLE what is the difference between this and that study and what books do you recommend i use for Bio statistics really need to know for a long time now
You can look under Step 1 books in this forum, there is a poll on biostats books. I personally recommend Kaplan with Daugretry's video. They are amazing. Not sure if its enough though. But should be enough when combined with QBanks, in my opinion.
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  #5  
Old 10-23-2009
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Originally Posted by jessp687 View Post
Do they asked you directly on the USMLE what is the difference between this and that study and what books do you recommend i use for Bio statistics really need to know for a long time now
Oh yes they sure do ask such kind of questions
In my exam I remember I got many of them
By the way, not only Step 1 but also Step 2 CK and Step 3
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