So, the Cronbach alpha drops down just because I (artificially) reduced the variance of item and total score. # 4 Slightly Accurate 5 Moderately Accurate 6 Very Accurate. # 1 Very Inaccurate 2 Moderately Inaccurate 3 Slightly Inaccurate # 25 items (5 factors) scored on a 6-point response scale: # Extraversion, Neuroticism, and Opennness. # personality test: Agreeableness, Conscientiousness, (2008) have shown that both the reliability and validity of a Likert Scale decrease. Here is a toy example using the R software, where I recode a subscale of a personality inventory originally scored on a 6-point scale to a 3-point scale: library(psych) In recent years, the use of Likert Scales has come under scrutiny. On the other hand, measurement is also known as a. This magnitude is represented by a unit of measurement, such as a meter, Celsius or a kilogram. Common definition for measurement is the process of determining the magnitude of a quantity, for example length, temperature, or mass.
Setting apart subtle issue with face validity (or concept close to the coverage and acceptability of the questionnaire), changing the number of response options will likely affect the variance of the response pattern matrix, hence any estimate for the internal consistency of the scale (Cronbach alpha or Guttman $\lambda_6$), especially when they are calculated on item variances and total test variance, i.e. Validity And Reliability Of The Likert Scale Psychology Essay.
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