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Have you check the "Submissions" page in your account? There are a couple of functions and setting that you can set up there. Here's a guide for that: http://www.jotform.com/help/269-How-to-view-Submissions.
But if you are looking to set conditional logic to them, I believe there is no similar function to set conditions in a created reports, these are the reports that you can create.
Here's the list of report type that you can create.
What you could also do is integrate Google Spreadsheet to your form, in that way you can set formula on your live spreadsheet, similar to like a conditional logic: http://www.jotform.com/help/228-How-to-Integrate-Form-with-Google-Spreadsheet.
I hope that helps.