Socialism is collective ownership of property for the common good. Statism is centralized government planning of the economy.
Well, now I am confused.
Polly Sci 101 that I studied, (granted, that was a Loonnnggg time ago) generally put forth that statists believed in the omnipresence of the "state", which is central to collective ownership.
Collective ownership relies on statism to exist.
(abstracts like this could cause a whole new thread!)