Does having blog on subdomain weaken primary site's SEO?

[sDevik]

I have a Joomla site with a WordPress subdomain that I'm wanting to use as a learning center. It's far more simple for new blog editors and publishers to learn that over Joomla. The issue I'm facing is trying to figure out rather having the blog put into the primary domain instead of a subdomain will hurt my ratings at all?

Where I got the idea that it may hurt ratings is due to how (from what I understand) search engines will see a subdomain slightly different than the primary domain.

Thank you for any help!

[EGOL]

If the blog is in a folder on your primary domain then any links earned by the blog will directly benefit the primary domain.  If the blog is on a subdomain then links that it earns will benefit the primary domain but the effect will not be as strong.

All of my blogs are on folders of the primary domain.

In late 2010 I redirected a couple of popular subdomains into folders of the primary and the rankings of the entire site went up.

[sDevik]

If I'm not mistaken, it won't be possible for me to run WordPress site within Joomla if it's under the same domain.

I appreciate your response.

[EGOL]

I don't use Joomla, so it would be best to check the documentation or ask someone who is experienced with that system.

[MattJanaway]

Agreed. I always install mine on the primary domain. Usually mydomain.com/news or mydomain.com/blog.