Data analysis-with-spss-reliability

1. Analyzing Data Using SPSS
(Reliability)

2. Obtaining Reliability of Scale
Obtaining Cronbach’s Alpha:
Analyze → Scale →Reliability Analysis

5. Reliability
Model → Alpha

7. Reliability
• Drag items on the left to the right
dialog box
– In this case: items p1 to p21

9. Reliability
• Press “statistics”
• Choose “scale if item deleted”
• Then Press “continue”
• Then “OK”

11. Reliability
• The SPSS Output

13. Case Processing Summary
672 100.0
0 .0
672 100.0
Valid
Excludeda
Total
Cases
N %
Listwise deletion based on all
variables in the procedure.
a.
672 cases (observations/respondents) were used
in the calculation of Cronbach’s alpha

14. Reliability Statistics
.915 21
Cronbach's
Alpha N of Items
The obtained alpha score is 0.915,
which indicates that the scale
has high internal consistency
(reliability)

15. Item-Total Statistics
79.32 128.717 .526 .911
79.55 127.604 .541 .911
79.80 127.911 .489 .912
79.70 126.154 .561 .911
79.82 124.242 .653 .908
79.88 124.296 .621 .909
79.32 127.197 .592 .910
79.48 127.201 .588 .910
79.37 128.648 .509 .912
79.48 126.077 .615 .909
79.42 125.346 .610 .909
79.25 124.597 .647 .909
79.47 124.878 .589 .910
79.95 125.219 .491 .913
79.63 126.532 .593 .910
79.51 128.632 .491 .912
79.81 129.365 .422 .914
79.66 126.834 .564 .910
79.37 125.426 .629 .909
79.27 127.141 .617 .910
79.42 131.546 .345 .915
p1
p2
p3
p4
p5
p6
p7
p8
p9
p10
p11
p12
p13
p14
p15
p16
p17
p18
p19
p20
p21
Scale Mean if
Item Deleted
Scale
Variance if
Item Deleted
Corrected
Item-Total
Correlation
Cronbach's
Alpha if Item
Deleted
Under the “Cronbach’s Alpha if Item deleted” the
reliability of 0.915 is the highest, so it is not
necessary to delete any of the items to improve the
reliability score of this scale