# Composite variable from Likert items

I have six 5-point Likert items (1-Strongly Disagree, 2-Disagree, 3-Neither agree or disagree, 4-Agree, 5-Strongly Agree) which are related to my dependent variable. I sum the six variables which gives the frequency as follows:

    Frequency
6.00    1
9.00    1
12.00   6
13.00   3
14.00   3
15.00   18
16.00   11
17.00   4
18.00   17
19.00   11
20.00   14
21.00   22
22.00   15
23.00   9
24.00   11
25.00   2
26.00   3
30.00   2
Total   153


Now I want to recode the sum variable again into a 5-point scale (1-5) to get a composite score of my dependent variable. I will use this composite dependent variable in further analysis of ordinal logistic regression. My question is this:

What is the best way to recode the sum again into 5-point scale? Or, please let me know if there exists any better way to create a composite scale from Likert items?

just to clarify my quesion: I have six variables that are related to my DV, all are on 5 point likert scale. and I could not find the best way to reduce these six variables into one. The composite score may be considered as one of the option.

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Your decision appeares inconsistent. By virtue of summing up 6 rating items into the total score you discard your attitude to those six as ordinal level-of-measurement scales; instead, you treat them as interval ones. On the other hand, you disbelieve the total score to be interval - as seen in you wish to categorize it and input to ordinal regression. That means that you fully disregard your done action of summing up. Why then you chose just summing and not some other way of combining?

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thank its very useful –  wxa Jan 17 '12 at 2:15

You seem to have made up your mind that you want to turn this 6-30 variable, which for all we know may communicate finely grained information, into a coarser 1-5 variable which figures to have lower reliability. Also that you want to conduct an ordinal logistic regression. To tell you the truth it's hard to see good reasons for these decisions.

Moreover --and backing up--it's not always obvious that 6 different rating items will yield a valid and reliable indicator if summed to create a composite. You'll see why if you browse through threads on this site related to the tags of scale, composite, psychometrics, and/or Likert.

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