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Hi Ana, With 3 visits, you'd use 2 EVs to represent them. In each, you put the value of the first visit as is, and the value of the second visit (1st EV) or of the third visit (2nd EV) with the sign reversed. Feel free to post an example design if you'd like to double check. All the best, Anderson On Thu, 15 Nov 2018 at 04:01, Ana Coelho <[log in to unmask]> wrote: > Hi Anderson, > > In this case I have 3 visits. How should I add the nuisance taking into > account that it will affect the differences between visits? > > Thanks! > Best regards, > Ana > > ######################################################################## To unsubscribe from the FSL list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=FSL&A=1