A function that samples multivariate normal (logspace) variables
negcorlogspace(xmu, ymu, xcv = 0.1, nsim, cor = -0.9, ploty = F)
The mean (normal space) of the first (x) variable
The mean (normal space) of the second (y) variable
The coefficient of variation (normal space, log normal sd) of the x variable
The number of random draws
The off-diagonal (symmetrical) correlation among x and y
Whether a plot of the sampled variables should be produced