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Flashcards in Biostats and Ethics Deck (10):
1

RR and OR are important equations

Know them

2

2 X 2 table for risk of disease?

Disease comes out on top. Then do like so

A B
C D

3

What is relative risk?

Risk of getting disease in exposed population

Compared to

Risk of getting disease in unexposed

4

Whats odds ratio?

Odds ratio is same as relative risk if prevalence is is SUPER LOW!!! (basically able to take out A and C in dividing)

A/B / C/d

5

Number needed to treat calculation?

1/ absolute risk reduction

So 1/( C/(C+D) - A/(A+B) )

6

Positive likelihood ratio is what?

Sensitivity / (1-specificity)

Or sensitivity/false positive ratio

7

What is negative likelihood ratio?

(1-sensitivity)/specificity

Or false negative rate/specificity

8

Type 1 error is what?

Null hypothesis rejected even thought its true

Type 1 FIRST TO LIE and say there is affect where there isn't!

9

Confidence Interval calculations?

CI = Range from mean -Z(SEM) to mean +Z(SEM)

90% z is about 1.6
95% Z is about 2, 99 Z is about 2.6

10

Z for 90, 95, 99% CI?

1.6, 2, 2.6

mean +/- Z SEM