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Reliability
A scale (a group
of similar questions) is said to be reliable
when the results obtained from it are
repeatable and consistent. One of the
most commonly used reliability coefficients
is Cronbach's Alpha. Alpha is a measure
of the internal consistency of a scale
and is based on the average correlation
of items within the scale. Positive correlations
between the items in a scale are expected
because they all measure the same construct.
Alpha levels range from -1.0 to +1.0;
the closer to +1.0, the more reliable
the scale. Scales with alphas above +0.7
are considered to be very reliable.
Analyses of reliability were conducted
on several scales within the Primary Prevention
Awareness, Attitude, and Use Survey for
the Franklin County Schools. Results of
those analyses are shown below.
RELIABILITY
COEFFICIENTS
Franklin County Safe and Drug-Free Schools
Consortium
| |
#
of Items |
PPAAUS
Item numbers
|
6th
-8th
Grades
|
9th
-12th
Grades |
| Scale |
|
Cronbach’s
Alpha |
| Problem
Behaviors |
5 |
83-87 |
.6814 |
.6971 |
| Well
Being |
6 |
131-136 |
.5912 |
.6088 |
| Willingness
to Use |
8 |
10-12,
17,19-22 |
.8109 |
.8479 |
| ATOD
Use |
8 |
23-25,
31, 33-36 |
.7209 |
.7673 |
| Perpetrators |
5 |
62-66 |
.8030 |
.8150 |
| Victims |
4 |
68,
70-71, 73 |
.6432 |
.6437 |
| Perception
of Peer Use |
3 |
40-42 |
.8456 |
.7583 |
| Decision
Making |
3 |
7-9 |
.5994 |
.6905 |
| Messages
from Parents |
3 |
113,
119, 125 |
.8031 |
.7642 |
| Messages
from Friends |
3 |
114,
120, 126 |
.9050 |
.8200 |
| Messages
from Teachers |
3 |
115,
121, 127 |
.8789 |
.8615 |
| Messages
from Coaches |
3 |
116,
122, 128 |
.9554 |
.9312 |
| Messages
from Club Advisors |
3 |
117,
123, 129 |
.9583 |
.9505 |
| Messages
from Media |
3 |
118,
124, 130 |
.8877 |
.8149 |
| School
Climate – Learning Environment |
3 |
46,
51, 55 |
.6972 |
.6822 |
| School
Climate – Discipline |
4 |
43,
52, 58-59 |
.8087 |
.7867 |
| School
Climate – Students & Staff |
7 |
44-45,
47, 50, 53-54, 56 |
.8102 |
.7813 |
| School
Climate – Students & Other Students |
2 |
48-49 |
.8136 |
.8172 |
| School
Climate – Staff, Students, parents
and community |
2 |
57,
60 |
.7620 |
.7616 |
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