Migraine screen questionnaire: further psychometric evidence from categorical data methods

Table 5 Summary of the factor extraction measures used in exploratory factor analysis of the Migraine Screen-Questionnaire (MS-Q) scores in Ethiopian university students

Number of Factors	Eigenvalue	Cumulative VA^b	Above point of inflection on Scree plot	PA based on minimum rank			Decision to extract
Number of Factors	Eigenvalue	Cumulative VA^b	Above point of inflection on Scree plot	Real-data VE^b	Mean of random VE^b	95th percentile of random VE^b	Kaiser’s criteria (Eigenvalue≥1)	Cumulative VE rule (> 40%)	Scree test	PA 95th percentile of random VE > Real-data VE
1	3.599	71.982	Yes	88.8386^b	59.6842	76.9187	^a	^a	^a	^a
2	0.521	10.420	No	9.2623	32.3088	44.6539	Χ	Χ	Χ	Χ
3	0.409	08.185	No				Χ	Χ	Χ	Χ

ISSN: 1477-7525