[Rasch] negative alpha
Parisa Daftari Fard
pdaftaryfard at yahoo.com
Sat Dec 6 07:54:28 EST 2014
I have run itemman on a set of data and come up with the following result. Why alpha turned to be negative? I appreciate your incisive comments on the result.
N of Items 8N of Examinees 22Mean 2.864Variance 1.027Std. Dev. 1.013Skew 1.061Kurtosis 0.006Minimum 2.000Maximum 5.000Median 3.000Alpha -0.754SEM 1.342Mean P 0.358Mean Item-Tot. 0.263Mean Biserial 0.337Max Score (Low) 2N (Low Group) 10Min Score (High) 3N (High Group) 12
One more time, I appreciate your prompt reply in advance
Parisa DaftarifardPhD Candidate of TEFLIAU (South Tehran Branch)
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