My website has a homepage on www.example.com and various subdomains on site1.example.com, site2.example.com,etc. Now, www.example.com has an Analytics script for itself and so is the case with each of the subdomains - i.e. they all have their own analytics scripts.
Now when I measure the traffic on site1.example.com, I notice that I hardly see any referral visits from www.example.com. The homepage is a huge brand and has a lot of direct visits to the homepage that trickles down to the various subdomains. So it is unlikely that I don't see any great traffic from the homepage. On the other hand, there is a huge chunk of direct visitors to the subdomain.
Since www.example.com and site1.example.com have different analytics accounts, I thought I should be seeing traffic from the homepage as a referral. Am I right in assuming this? Or does Google automatically assume traffic from the main domain of a site as direct? Your suggestions will be helpful.