Flashcards in Chi Square Test, McNemar Test Deck (8)

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1

## A Chi Square Test is...

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used to compare two or more independent groups for their proportions

a statistical hypothesis test that uses a test statistic with a known probability distribution of chi-square distribution

2

## How can you test statistically the effect of a new medication over the standard treatment on hypertensive subjects?

### Run a statistical hypothesis test to compare the proportions of those who were responsive between experimental vs control groups.

3

## Degree of Freedom

### number of values that are free to vary as you estimate parameters

4

## OR =

### (a/b)/(c/d)

5

## RR =

### [a/(a+b)] / [c/(c/d)]

6

## Assumptions for valid chi square tests

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groups are independent

the value of the cell expected count should be 5 or more in at least 80% of cells

no cell should have an expected count less than 1

7

## McNemar test

### form of chi square test used with 2x2 contingency table that involved matched samples, where subjects act as their own controls

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