LIKERT SCALE
CHARACTERISTICS
2.
Response
levels are arranged horizontally.
3.
Response
levels are anchored with consecutive integers.
4.
Response
levels are also anchored with verbal labels which con note
more-or-less evenly-spaced gradations.
more-or-less evenly-spaced gradations.
5.
Verbal
labels are bivalent and symmetrical about a neutral middle and
6.
In Likert's
usage, the scale always measures attitude in terms of level of agreement/disagreement
to a target statement .
Criterion 5 usually means there is an odd number of response
levels. Typically the number is 5, though sometimes 7, 9, or 11 levels are
used.
Common
Error 1
A
Likert scale is never an individual item; it is always a set
of several items, with specific format features, the responses to which
are added or averaged to produce an overall score or measurement.
|
First:
A single item, even if formatted exactly as one of Likert's items, is not a Likert scale.
Likert
items
If
features 2 through 5 above are all present, we may justifiably call them Likert
items. If only 2 through 4 are present, we might call them Likert-type
items instead.
How do you feel about the President's performance in domestic affairs?
Strongly Somewhat Somewhat Strongly
disapprove disapprove Neutral approve approve
1 2 3 4 5
|
Example
2: A Likert item
Consider the example above. Here we meet all criteria 2 - 5.
It seems fair to call this a Likert item, even though it doesn't refer to
agreement/disagreement to a target statement. The following, then, would be considered a Likert-type item.
How often do you go out to see a movie?
Very
Never Sometimes Average Often often
1 2 3 4 5 |
Example 3: A Likert-type item
Here the
response levels are not bivalent: the lower terminus is merely
"Never". There is no exact opposite of "Very often". Yet
the categories are reasonably interpretable as evenly spaced, especially when
associated with consecutive integers in an evenly-spaced printed format. The
label for level 3, "Average" clearly denotes centrality of this
response category.
Common
Error 2
This is not a Likert-scale, a Likert item,
or a Likert-type item: How often do you smoke cigarettes?
1. Never
2. Once in a while
3. 1-5 per day
4. More than 5 per day. |
This is simply an item with ordered response levels, or an ordered-category
item.
This is so even if the item is one of several that will be
combined to form an aggregate scale. In this case, one simply has a summated
rating scale comprised of several ordered-category variables.
The method of construction of a Likert type scale-
Researcher
gathers a large number of statements which clearly indicate favourable or
unfavourable attitude towards the given issue.
·
Piloting
·
Validity test
·
Content validity
Scoring and analysis
After the questionnaire is completed, each item may be
analyzed separately or in some cases item responses may be summed to create a
score for a group of items. Hence, Likert scales are often called summative
scales .
After the Likert scale is administered to subjects, the
response must be scored. Typically the responses are scored in such a way that
endorsement of positively worded statements and nonendorsement of negatively worded statements are scored higher
ADVANTAGE
-Construction
is less cumbersome
-It
supplies more precise and definite response towards an issue.
-Permits
the revelation of several (5) degrees of
agreement or disagreement
-Has
broader areas of reference as any item empirically consistent with the
statement may be included.
LIMITATIONS
-The
judgment on the basis of total score , which
is estimated by calculating mean or median , is not scientific. The
total score value may be same in many cases but attitude may be different.
-No
objective basis for expressing different degrees of agreement or disagreement.
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