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

Figure 1.

Figure 1

Influence of random responses (pR) on Cronbach's alpha (αT for the true responses) for different percentages of fixed responses (pF) and mean differences between the true and random responses (μTR). There are 5 positive polarity items, each responded on a 5-point Likert scale.