Flashcards in Categorical data 1 Deck (12)

Loading flashcards...

1

## When carrying out tests for proportions what makes them valid in a one sample test?

### when r>5 and (n-r)>5 where r is the number in the sample with the characteristic of interest

2

## In a two-sample test of proportion what is necessary to make it valid?

### r1, R2, (n1-r1) and (n2-r2) are all >5

3

## What is the simplest approach of carrying out a test of association?

### Chi-squared test

4

## What is the Chi-squared test?

### X2 = sigma (obs-exp)2/exp

5

## What are the assumptions for a Chi-squared test?

###
observations are from independent subjects or experimental units

The expected values are not too small as a rough rule, no more than 20% of the expected values should be <5 and none should be <1

6

## What test should be used instead of a Chi-squared test if the variables are ordered?

### Chi square test for trend (trend needs to be linear to be appropriate)

7

## In the case of a 2X2 table, what test should be carried out when the values of interest are very small?

### Chi squared test with continuity correction (conservative) or Fisher's exact test

8

## What tests can be used for comparisons of proportions from paired samples?

###
Paired confidence interval

McNemar's test

9

## What test should be used for 1 variable with 2 categories?

### 1 proportion CI and test

10

## What test should be used in a 2x2 table?

###
2 proportion CI and test

Chi-squared test of association

Chi-squared test of association with continuity correction

Fishers exact test

11

## What test should be used in >2x>2 table

###
Chi-squared test of association

Chi-squared test for trend( if categories ordered)

or collapse rows and/or columns to 2x2

12