Catina, just a note on Jay's recommendation (which is indeed the best you can do with the available data): remember that a single human lead can have 0 or more anonymous web sessions and 0 or more associated web sessions in action at the same time. For example, if I follow a PPC link on my desktop, then re-Google (or navigate directly) on my mobile and fill out a form, the first session is anonymous (and would appear in a WPA report set to source = anonymous) while the second session is associated (and would appear in the other WPA report set to source = known). Therefore, on the same day, the same human is represented by both a previously-anonymous conversion and a still-anonymous session. The numbers will converge toward real truth over time (if you go back and re-run the report) but must be considered "directional" rather than exact.
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