I saw few researchers used -2 -1 0 +1 +2 scale for 5 point Likert scale which makes sense to me (“Neutral” is given 0 points, “Agree Slightly” is given 1, “Agree Strongly” is given 2. On the other side, “Disagree Slightly” is given -1, “Disagree Very Much” is given -2). Example above contains same number of positive and negative values, as well as a zero (“neutral”) value that allows respondents to withhold their opinion.
Unfortunately, I couldn't find any reference for that! Is anyone aware of any references?
Thank you for any feedback.
Thank you Dr. Raid. But, I'm looking for some insights about the preference of using this scale (2 -1 0 +1 +2) to 1 2 3 4 5 scale. Also, I need to know some references that used this scale.
Thanks again.
Here are some links that may help you:
http://www.socialresearchmethods.net/kb/scallik.php
http://asq.org/quality-progress/2007/07/statistics/likert-scales-and-data-analyses.html
Best, Thanasis
Have a look at
Revilla, M, Saris, W, E. & Krosnick, JA 2014, 'Choosing the Number of Categories in Agree-disagree Scales', Sociological Methods & Research, vol. 43, no. 1, pp. 73-97.
And for a slightly different tack
Saris, W, E., Revilla, M, Krosnick, JA & Shaeffer, EM 2010, 'Comparing Questions with Agree/Disagree Options to Questions with Item-Specific Options', Survey Research Methods, vol. 4, no. 1, pp.