This article describes how to create a correlation scatterplot matrix from a series of variables. The correlation scatterplot matrix shows a matrix where the lower triangle displays scatterplots of variable pairs, the diagonal displays variable histograms and the upper triangle displays correlations of variable pairs. Also known as a *SPLOM*.

## Requirements

- A series of categorical or numeric variables to use as correlation inputs.
- See Variable Sets for more info on how to set the measurement scale and values for analysis.

## Method

- From the
**toolbar**, select**Anything > Advanced Analysis > Correlation > Scatterplot Matrix**. - From the
**object inspector**, select variables from the**Variables to plot**drop-down or drag them from the**Data Sets**tree into the**Variables to plot**box. - Click
**Calculate**. - OPTIONAL:
**Variable names**- toggle this on to show variable names in the matrix instead of variable labels. -
**Missing data:**Method for dealing with missing data.**Error if missing data**- An error is returned if any of the data used in the analysis contains missing values.**Exclude cases with missing data****Use partial data**- The analysis is conducted using all the data for each case. For example, in K-Means Cluster Analysis, if there are nine variables in the analysis, and a case only has data for six, then the case is assigned to the most similar cluster based on the data for the six variables.

**Fitted line:****None**- No fitted line is shown in each scatterplot.**Straight**- A line of best fit (from linear regression) is shown in each scatterplot.**LOESS**- A line generated using fitted values from locally weighted polynomial regression is shown in each scatterplot.

**Scatter point modifications:****None**- No modifications.**Jitter**- Add noise to each point so that areas with closely positioned points appear denser.**Enlarge points with multiple observations**- Multiple points with identical positions will appear as an enlarged point. This is the default.

OPTIONAL: Further visual modifications can be made via the **Chart** tab in the **object inspector**.

This tab contain options for formatting the text and graphical elements in the chart. It is organized into groups for **CORRELATION **(panels in the upper-right triangle), **SCATTERPLOTS **(panels in the lower-left triangle) and **HISTOGRAMS **(panels along the diagonal).

## Next

How to Create a Correlation Matrix

How to Conduct a Test of Correlation Between Two Variables

How to Create a Table of Coefficients from a Correlation Matrix