[Rasch] negative alpha

Parisa Daftari Fard pdaftaryfard at yahoo.com
Sat Dec 6 07:54:28 EST 2014


Dear Friends,
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
BestParisa
Parisa DaftarifardPhD Candidate of TEFLIAU (South Tehran Branch)
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