[R] MLE for two random variables

[Carsten Steinhoff]

Hello,

I've the following setting:

(1) Data from a source without truncation		(x)

(2) Data from an other source with left-truncation at threshold u	(xu)

I have to fit a model on these these two sources, thereby I assume that both
are "drawn" from the same distribution (eg lognormal). In a MLE I would sum
the densities and maximize. The R-Function could be:

function(x,xu,u,mu,sigma)
dlnorm(x,mu,sigma)+(dlnorm(xu,mu,sigma)/(plnorm(u,mu,sigma)))

So I tried to use the function FITDISTR for the MLE. But unfortunately it
only accepts ONE random variable.
Then I tried to combine x and xu in a vector, but that doesn't work, too,
because the length of x and xu differs.

Does anybody has a solution for my problem?

Thanks in advance.

Carsten