On Thu, 14 May 2020 15:05:05 -0700 (PDT),
hamzakabli6@gmail.com wrote:
On Saturday, February 3, 2007 at 11:30:18 PM UTC+5, caroline wrote:
Hello,
In my survey questionnaire, I have negative worded questions.
lest say there are 08 questions of customer satisfation(dependent
variable) on lickert scale in which few of them are negative worded.
i did reliability, correletaion and regression analysis. crown bach
< cronbach >
alpha was above 85% and all varibales were significant but when
i recoded those negative questions my reliability decreased to 55%
and all variables became insignificant
Basically: Not possible that you did correctly what you said.
If there were "08" items with a few in the wrong direction, you
did not get an alpha of 0.85. For 80 items, a few could be
swamped. But correcting the direction of good scores only
increases the alpha, as you surely expect.
If alpha goes down when you "correct" the directions, then
I assume that your reversal screwed up. The uncorrected
correlation matrix should have a bunch of negative r's;
the corrected will have (probably) none, if it is right.
For an item scored 1-5, you can reverse it by subracting
from 6. One way that this can screw up is if Missing is not
yet defined and there are Missing scores of 9 or -9, which
then get rescored to odd numbers. There is a bigger effect
on the computed alpha if the unrecognized missing is big,
like "99", because alpha is a ratio of variances
my question is what should i do now? is it necessary to recode
those questions ? if not then why not ? and is there any other
way to increase crown bach alpha?
You quoted from Caroline only the Hello.
Ray Koopman gave the good answer, found at
https://groups.google.com/forum/#!topic/comp.soft-sys.stat.spss/-c04zC3_dNM
In short: Start by reverse-scoring the items with reversed
meaning relative to the latent factor.
Okay, you tried that. Now, check your item means and
frequencies, to make sure that you don't screw up (and
that Missing is properly accounted for). Look at the
correlation matrix.
Everything should work out from there.
--
RIch Ulrich
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