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Principal Components Analysis, Factor Analysis or Cluster Analysis to name a few. Any recognised statistical software package would be able to do this for you. If you would like further information I can give you some references which would explain the methods in further detail. Ian Ratcliffe Statistician, Drug Safety Research Unit Southampton, UK. Sent from my iPhone On 29 Jul 2013, at 18:23, "Angelica Neisa" <[log in to unmask]> wrote: > Hello Everyone, > > I have a list of 80 people,each of them with a list of personal products used in the last 24 hours. I want to find groups of items that are commonly used together. What statistical technique would you recommend to this? > > Thanks you very much for your answers, > > Angelica, > > You may leave the list at any time by sending the command > SIGNOFF allstat > > to [log in to unmask], leaving the subject line blank. You may leave the list at any time by sending the command SIGNOFF allstat to [log in to unmask], leaving the subject line blank.