Where are delivery indicators statistics calculated in Adobe Campaign?

Hello,

I would like to understand where delivery and tracking indicators are calculated.

For instance, looking at Delivery and tracking statistics (nms:deliveryLogStats) I have these indicators:

    <attribute label="Messages that were clicked" name="clicked" type="long"/>

    <attribute label="People who clicked" name="personClick" type="long"/>

    <attribute label="Recipients who clicked" name="recipientClick" type="long"/>

    <attribute label="Total number of recipients who clicked" name="totalRecipientClick"

               type="long"/>

In this case, it's not clear the meaning of personClick as is less than recipientClick and I don't understand how it is calculated.

Thanks,
Salvatore

Amy_Wong​ Ananya Kuthiala​ Vipul Raghav​ Amit Kumar​ Adhiyan​ Adobe Campaign​