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Exploring datain SPSS

Descriptive statistics

③

Start up SPSSto show Data View

Data View

“2-1 Test_data.sav”

SPSS exercise Descriptive commandData: 2-1 Test_data.sav

(Analyze) (Descriptive statistics) Descriptives)【Dialog】 Assign “English test score”, “Math test score”

“Science test score” to VariableClick Options

Option Check MeanCheck Std. deviation, Variance,

Range in DispersionCheck Kurtosis, Skewness in DistributionCheck Variable list in Display Order

Continue OK

(Ex) Find mean, variance, standard deviation for Language,English, Mathematics, Science.

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To check that the distribution of scores is approximately normal, we need tolook at the values of skewness and kurtosis in the SPSS output.

Positive values of skewness indicate too many low scores in the distribution,whereas negative values indicate a build-up of high scores.

Positive values of kurtosis indicate a pointly distribution, whereas negativevalues indicate a flat distribution.

The further the value is zero from zero, the more likely it is that the data arenot normally distributed

Explore commandData: “2-1 Test_data.sav”

Analyze (Descriptive statistics) (Explore)【Dialog】 Assign “English test score” to

Dependent ListAssign “Sex” to Factor listClick Statistics

Dialog Check DescriptivesContinue OK

Stem-and-Leaf plot is obtained

SPSS exercise 2

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Frequencies commandData: “2-1 Test_data.sav”

Analyze (Descriptive statistics) (Frequencies)Dialog Assign “Language test score” to Variable

Click “Statistics”Dialog Click Mean, Median, Mode

Percentile(25, 50, 75)Continue

Click ChartsDialog Click Histogram

Request With Normal curveContinue OK

SPSS exercise 3

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Z

Standardization

Z score

Variable

Mean

Standard deviation

SPSS exercise 4

What is “standardization”?

5

4

3

2

1

X = 3

σ＝1.58

1.265

0.632

0

- 0.632

-1.265

X = 0

σ＝1

StandardizationData: “2-1 Test_data.sav”

(Analyze) (Descriptive Statistics) (Descriptives)Dialog Assign “English test score” to Variable(s)

Click "Save standardized values as variable”at the bottom of the window OK

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Ｚ =X － 70.1

11.19163

Mean of Z = 0

σｚ = 1

Data View

In-class exercise

Find

1. Mean, Standard deviation, Variance

2. Median and Mode

3. Stem-leaf plot expression

4. Histogram with a normal curve

5. Z-score

Data: (3-1) Test score.sav

(Analyze) (Descriptive statistics) Descriptives)

Find Mean, Standard deviation, Variance

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Find Median and Mode

Analyze (Descriptive statistics) (Frequencies)

Find Stem-leaf plot

Analyze (Descriptive statistics) (Explore)

Find z-score

(Analyze) (Descriptive Statistics) (Descriptives)

Find Histogram with a normal curve

Analyze (Descriptive statistics) (Frequencies)

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Today’s homework:

Homework 3

Chapter 3 of the textbook furthercovers the following topics:

1. Sorting a file

2. Splitting a file

3. Computing new variables

4. Other useful functions

I strongly recommend you to review the techniquefor computing new variables