Can readers suggest textbooks or papers containing methods for
developing scales in general, where the variables to be combined may
contain a mixture of ordinal and interval/ratio data ? (eg the former
from questionnaires or interviews, the latter from clinical
measurements; the interval data may, if necessary, be dichotomised or
even polychotomised for this purpose). Are there standard
procedures in well-known packages like STATA or SPSS for doing
this?
Regards
Miland Joshi
Department of Epidemiology and Public Health
University of Leicester
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