Abstract
Objective: The study aims at finding out the affect of reliability and validity for the compulsive buying behavior scale by Valence, d’ Astou’s and Fortier Scale without middle point.
 Methodology: Responses across 5 to 9 point scales are obtained to calculate the reliability and validity of compulsive buying behavior scale by Valence, d’ Astou’s and Fortier Scale. Cronbach’s alpha is used to measure the internal reliability of the scale. To compare the reliability coefficients among different scale points Feldt test and Hakstian-Whalen test are used. Convergent validity for measuring inter-correlations between scales with different numbers of response categories is used and Fisher’s –r to –z transformation is used to test population correlation coefficient.
 Conclusion: From study it is concluded that there is no change in reliability and validity when the middle point is dropped from the compulsive buying scale.
Highlights
The main purpose of a rating scale is to allow respondents to express both the direction and strength of their opinion about a topic
Point is 0.9081, using the Fisher r-to-z transformation to assess the significance of the difference between two correlation coefficients, we calculate a value of z which is 0.07(p-value is 0.9442>0.05) and is not significant at
The correlation coefficient between (6, 7) point is 0.9081 and that of (7, 8) point is 0.9138, using the Fisher r-to-z transformation to assess the significance of the difference between two correlation coefficients, we calculate a value of z which is 0.23(p--value is 0.8181>0.05) and is not significant at 5% level
Summary
The main purpose of a rating scale is to allow respondents to express both the direction and strength of their opinion about a topic. Market researchers would prefer respondents to make a definite choice rather than choose neutral or intermediate positions on a scale. For this reason, a scale without a midpoint would be preferable, provided it does not affect the validity or reliability of the responses. Matell and Jacoby (1972) demonstrated that as the number of scale steps is increased, respondents' use of the mid-point category decreases. The authors, Matell and Jacoby's (1972) advice on minimizing usage of the mid-point category was to either not include it at all or use scales with many points They concluded by stating that "the decision would seem to depend on the level of 'uncertain 'responses one is willing to tolerate"
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