Which statistical test should I use?

By Data Tricks, 29 May 2020

I created this interactive tool to help you choose which statistical test is the most appropriate for your analysis.

Any comments, reports of bugs or broken links are all welcomed.

To start again, refresh your screen.

What are you assessing?

Differences between samples

I have split my data into groups and want to compare those groups

Relationships between variables

I am looking for links between variables

How many samples do you have?

One sample

I have a single sample and I want to see if the average is different from a fixed value

Two samples

I have two samples and want to see the differences between them

Multiple samples

I have more than 2 samples and want to see the differences between them (note if your independent variable has more than 2 levels then you effecitvely have >2 samples)

Are your samples paired?

Yes

My samples are paired

No

My samples are not paired

Are your samples matched?

Yes

My samples are matched

No

My samples are not matched

How many independent variables are there?

One

Two

More than two

What is the distribution of your data?

Parametric

Non-parametric

Do you have dependent and independent variables?

Yes

There are clearly defined dependent and independent variables

No

The variables are interdependent

What's the measurement scale of the variable you want to test?

Interval

Your scale has an order and known differences between the values, eg. cm to measure distance, or height

Ordinal

Your scale has an order but different distances between values, eg. a rank order

Nominal

Your measure has no quantitative value, eg. gender

What's the measurement scale of your variables?

All are interval

All variables are on an interval scale

Interval and/or ordinal

I have interval and/or ordinal variables but no nominal variables

All are nominal

All my variables are nominal

What's the measurement scale of your dependent variable?

Interval

Your scale has an order and known differences between the values, eg. cm to measure distance, or height

Ordinal

Your scale has an order but different distances between values, eg. a rank order

Nominal

Your measure has no quantitative value, eg. gender

What's the measurement scale of your independent variable?

Interval

Your scale has an order and known differences between the values, eg. cm to measure distance, or height

Ordinal

Your scale has an order but different distances between values, eg. a rank order

Nominal

Your measure has no quantitative value, eg. gender

How many categories does your nominal dependent variable have?

Two

More than two

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