The calculated value reflects the result of your investment selections as well as any activity
They may have used something like NAV then, which is okay. Basically the idea is to value your portfolio as though it were a fund, with shares that you buy every time you add cash.
As far as the risk goes, I have taken on significant risk.
In theory that should boost your returns, a good portfolio just minimizes the risk/return tradeoff. The basic idea is that a 15% return can be just as good a performance as a 5% return if the risk levels are different. In theory anyway, this is where academics start arguing about beta and Sharpe ratios and such.
Anyway, I'd like to see two numbers - the return and also the variance in monthly (or even bimonthly) returns.
I usually only make 1-2 trades a quarter.