Logic Question

First

LODs are just a way to create a new layer in the data set - if you think of the data set as a pyramid - the data you  load is the base of the pyramid -  the top of the pyramid is the total of all the data in the data set

when you create an lod it results in a new virtual layer in the data that can be used in any form of calculation

so in your case  purchase indicator by date =  {Fixed (customer), (Date)  :  sum(  if [purchased item]="Y" then 1 else 0 end )}    in words it says for each combination of customer and date if the customer purchased something the 1 if not 0  - so far not so cool

next you want to determine a % that they bought v there total visits  customer level % purchases      {fixed  [customer] :    sum([purchast idicator]) / count([date])}

  or overall =                  {fixed  :    sum([purchast idicator]) / count([date])}

or you can put them together as

if size()=1 then sum([overall % purchases]) else sum([overall % purchases customer level)]) end

and you can see whichever level you want to see

Jim

If this posts assists in resolving the question, please mark it helpful or as the 'correct answer' if it resolves the question. This will help other users find the same answer/resolution.  Thank you.