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Flashcards in Biostats Deck (13):
1

compares group with a given exposure to those without exposure

Cohort-- relative risk
Who will develop disease

2

compares a group of people with a DISEASE to those without a disease

Case control-- odds ratio
Ask what happened

3

Phase 1-4

1- is it safe
2- does it work; side effects; efficacy
3- same or better
4-long term side effects?

4

Study only looking at inpatients

Berksons bias

5

type I error

see a difference when no difference exists-- i.e. reject null when we should accept

6

type II error

don't see a difference when there is one-- reject alternative when we should accpet alternative

7

Beta is?

The probability of making a type II error

8

statistical power=

1-beta
statistical power is the probability of rejecting the the null hypothesis when it is indeed false

9

Null hypothesis is not rejected when ...95%

when 95% confidence interval is zero when comparing means

or crosses 1 when comparing odds ratio or relative risk

10

test checks difference between 2 means

T test

11

test checks difference between 3 or more means

ANOVA

12

test checks difference between 2 or more CATEGORICAL outcomes

Chi square

13

Preventions?

Primary prevent
Secondary screen
Tertiary treat