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Thankyou to the many who gave very detailed responses. I have been asked to collate and distribute and hope to do this shortly. Meanwhile I have a further query - I'm not sure if I once knew this and have forgotten it, or whether I never knew it, but here it is: We have n=2000 respondents, each of whom answers a question on a 4-point scale, This is scored 1, 2, 3 and 4. There are subgroups, e.g. males and females, Labour or Conservative. Subgroup sizes range from about 100 to 1100. I calculate the average male response and the average female response: say 2.6 from 900 males and 306 from 1100 females. So the sex 'difference' is 1.0. What, pray, can I say about the error bounds of this difference? Thanks for any ideas or advice. Sincerely JOHN BIBBY The average response in subgroups A1 and B1 You may leave the list at any time by sending the command SIGNOFF allstat to [log in to unmask], leaving the subject line blank.