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8/3/2019 Exploring Data in SPSS
http://slidepdf.com/reader/full/exploring-data-in-spss 1/7
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.
8/3/2019 Exploring Data in SPSS
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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
8/3/2019 Exploring Data in SPSS
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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
8/3/2019 Exploring Data in SPSS
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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
8/3/2019 Exploring Data in SPSS
http://slidepdf.com/reader/full/exploring-data-in-spss 5/7
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
8/3/2019 Exploring Data in SPSS
http://slidepdf.com/reader/full/exploring-data-in-spss 6/7
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)
8/3/2019 Exploring Data in SPSS
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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