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Everyone, Factor analyses require a minimum of 100 subjects or 5 * (the number of variables (questions/items)). A 31-item questionnaire I am working with has had 140 respondents (short of the necessary 155), so my question is: is the data usable, but with reduced study power, or can it not be used ? Thanks in advance, Ian. Ian Clare Statistician Hunter Centre for Health Advancement Locked Mailbag 10 Wallsend. 2287 Ph: (02) 49246309 Fax: (02) 49246209 CONFIDENTIALITY & PRIVILEGE NOTICE The information contained in this email message is intended for the named addressee only. If you are not the intended recipient you must not copy, distribute, take any action reliant on, or disclose any details of the information in this email to any other person or organisation. If you have received this email in error please notify us immediately. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%