Dear allstat - I wish to model a variable which is the count of a number of
items (number of types of self reported delinquency in adolescents in the
last 12 months) - a further variable takes each item and multiplies this by
the number of times engaged in before summing. These variables look like
over dispersed Poisson variables (the variance/mean ratio is 3.4, 28.0 in
the two cases and there is some evidence of an excess in the second case
especially at zero - no delinquency). Previous analyses have grouped into
an ordinal variable and modelled accordingly but I am reluctant to take
this course as I feel I would be losing data. I am also reluctant to
consider transforming this towards a normal distribution, Can anyone suggest
a useful approach to analysis? I will summarise suggestions to the list.
******************************
Russell Ecob
Ecob Consulting
36 Prospecthill Road
Glasgow G42 9LE
Scotland, UK
+44(0)141-649-9387
www.ecob-consulting.com
[log in to unmask]
mobile: 0779-1956934
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.691 / Virus Database: 452 - Release Date: 26/05/04
|