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SPSS Stem-and-Leaf Guide

The document provides instructions for creating a stem-and-leaf display in SPSS to explore the shape of numerical variable data. It uses sample data on dioxin levels in Vietnam veterans. The steps are to enter the data, select descriptive statistics and explore from the menus, choose the variable and plot type, and copy the outputted stem-and-leaf display into a document for analysis. The display shows the frequency and values for concentrations of dioxin in plasma, with stems of 1 unit and leaves of 1 case, to examine the center, spread, skew and outliers of the data distribution.

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Nazia Syed
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39 views3 pages

SPSS Stem-and-Leaf Guide

The document provides instructions for creating a stem-and-leaf display in SPSS to explore the shape of numerical variable data. It uses sample data on dioxin levels in Vietnam veterans. The steps are to enter the data, select descriptive statistics and explore from the menus, choose the variable and plot type, and copy the outputted stem-and-leaf display into a document for analysis. The display shows the frequency and values for concentrations of dioxin in plasma, with stems of 1 unit and leaves of 1 case, to examine the center, spread, skew and outliers of the data distribution.

Uploaded by

Nazia Syed
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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SPSS Information Sheet 4

Stem and Leaf Displays


When we have a data set with a variable that has numerical values, we may wish to make a stem and leaf
display of the data from that variable in order to explore the shape of the data — center, spread, skew, gaps,
unusually high or low values, etc. SPSS will not really makes stem and leaf displays easily.

We will use the data from Problem 2.16 which gives parts per trillion of dioxin (2,3,7,8-TCDD) in blood
and fat tissue for 20 Massachusetts Vietnam war veterans, gotten as a result of exposure to Agent Orange.

Stem and Leaf Display


To make a stem and leaf display, we first enter the data as described in other handouts:

We then choose the Analyze menu:

and from it we choose the “Descriptive Statistics” sub-menu:

This opens a sub-menu window from which we can choose a Explore sub-menu:
This opens a window that allows us to define a stem and leaf display:

In this we choose a variable or variables for which to make a frequency table. In this case I have chosen the
plasma concentration of dioxin (TCDD) for the 20 veterans. In this case, we want a “Plot” and no Statistics,
so we choose the Plots circle. We push the Plots button, which displays a window:

We choose “None” for Boxplots (I haven’t done that here). We choose Stem-and-Leaf and click continue.
Notice this gives also an alternate way to do Histograms (and a way to do Boxplots different from that
which we will discuss later).
We then click OK (or its equivalent on the Explore window. This creates .spo output of a stem-and-leaf
display:

It should be saved and then cut and pasted into a document. Here we select the dispay (as indicated by the
box around it and arrow pointing to it) and then select “Copy Object” under the Edit menu. We can then
paste it into a document:
PLASMA Stem-and-Leaf Plot

Frequency Stem & Leaf

3.00 1 . 688
4.00 2 . 0155
5.00 3 . 01135
3.00 4 . 167
.00 5 .
2.00 6 . 09
1.00 7 . 2
2.00 Extremes (>=20.0)

Stem width: 1.0


Each leaf: 1 case(s)

Exercises
1. Use the data for Problem 2.14 in an SPSS Data Editor and save it as insect.sav on a floppy disk or hard
drive.
2. Make a Stem-and-leaf display of the Oxon variable.
3. Write one paragraph describing the shape of the data for the Oxon variable based on the display
4. Make a Word document with the display and your paragraph and turn it.

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