¶ … SPSS
How did you treat missing or oddly coded data, and outliers?
The SPSS function for Missing Data was used to identify any outliers or oddly coded data. The percent of missing data is high at 47.2% or 1063 potential responses to the question. The number of extremes or outliers in the high range is 220. Because the numbers are high, it would be useful to look at the raw data to determine how these answers were coded. This question is an interesting one and the pattern of responses suggests that additional analysis with this variable could reveal relationships with other factors.
What did you visually observe about your variables?
Responses to some of the questions are clustered for a number of the survey respondents. That is to say that there appear to be some respondents in the sample who are very active users of their cell phones and other respondents who barely use their cell phones.
What were the results of testing for normality for scale (interval or ratio) variables?
The Kolmogorov-Smirnov test for normality was used because of the size of N, although both Shapiro-Wilk and Kolmogorov-Smirnov statistics are shown in the data table. The p-value is
Weight
one>
Split File
one>
N of Rows in Working Data File
Missing Value Handling
Definition of Missing
User defined missing values are treated as missing.
Cases Used
All non-missing data are used.
Syntax
DESCRIPTIVES VARIABLES=q20
/STATISTICS=MEAN SUM STDDEV VARIANCE RANGE MIN MAX SEMEAN KURTOSIS SKEWNESS.
Resources
Processor Time
00:00:00.02
Elapsed Time
00:00:00.00
[DataSet1] / Users/Downloads/171243_May_2010_Cell_Phones.sav
Descriptive Statistics
N
Range
Minimum
Maximum
Sum
Mean
Std. Deviation
Statistic
Statistic
Statistic
Statistic
Statistic
Statistic
Std. Error
Statistic
Q20. On an average day, about how many text messages do you send and receive on your cell phone?
0
72991
61.39
5.330
Valid N (listwise)
Descriptive Statistics
Variance
Skewness
Kurtosis
Statistic
Statistic
Std. Error
Statistic
Std. Error
Q20. On an average day, about how many text messages do you send and receive on your cell phone?
33773.093
4.280
.071
18.173
.142
Valid N (listwise)
Statistic
Statistic
Statistic
Statistic
Statistic
Statistic
Std. Error
Statistic
Q20. On an average day, about how many text messages do you send and receive on your cell phone?
0
72991
61.39
5.330
Valid N (listwise)
Descriptive Statistics
Variance
Skewness
Kurtosis
Statistic
Statistic
Std. Error
Statistic
Std. Error
Q20. On an average day, about how many text messages do you send and receive on your cell phone?
33773.093
4.280
.071
18.173
.142
Valid N (listwise)
MVA VARIABLES=q20
/LISTWISE.
MVA
Notes
Output Created
07-AUG-2015 10:26:38
Comments
Input
Data
/Users/gigi/Downloads/171243_May_2010_Cell_Phones.sav
Active Dataset
DataSet1
Filter
one>
Weight
one>
Split File
one>
N of Rows in Working Data File
Syntax
MVA VARIABLES=q20
/LISTWISE.
Resources
Processor Time
00:00:00.03
Elapsed Time
00:00:00.00
Univariate Statistics
N
Mean
Std. Deviation
Missing
No. Of Extremesa
Count
Percent
Low
High
q20
61.39
47.2
0
a. Number of cases outside the range (Q1-1.5*IQR, Q3 + 1.5*IQR).
Summary of Estimated Means
q20
Listwise
61.39
All Values
61.39
Summary of Estimated Standard Deviations
q20
Listwise
All Values
Listwise Statistics
Listwise Means
Number of cases q20
61.39
Listwise Covariances
q20
q20
33773.093
Listwise…
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