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. 2010 Mar 12;8:27. doi: 10.1186/1477-7525-8-27

Figure 2.

Figure 2

Influence of fixed responses (pF) on Cronbach's alpha (αT for the true responses) for different percentages of random responses (pR) and numbers of positive (m+) and negative (m -) polarity items, m+-m - . The mean random/fixed response is identical to that of the true responses, and there are 5 items, each on a 5-point Likert scale.