You can find research summaries, like this one here, over at the Homeless Hub website - ith over 30,000 resources, the Homeless Hub is the largest repository of #homelessness information in the world. And much of it is #Canadian.
Veteran homelessness declined by 24% between 2009 and 2013 http://www.homelesshub.ca/blog/ask-hub-veterans-and-homelessness
This "Ask The Hub" blog post asks how can we help chronically homeless people adjust to long-term housing? Those with positive PTSD screens had been #homeless longer and were more likely to have met time criteria for chronic #homelessness. They were significantly more likely to be #veterans and to report violent attacks, #abuse histories, and mental health problems. Importantly, only 69% of those with positive #PTSD screens acknowledged current mental health problems.