I want to generate 2 continuous random variables `Q1`, `Q2` (quantitative
traits) and 2 binary random variables `Z1`, `Z2` (binary traits) with given
pairwise correlations between all possible pairs of them.
Say

    (Q1,Q2):0.23
    (Q1,Z1):0.55
    (Q1,Z2):0.45
    (Q2,Z1):0.4
    (Q2,Z2):0.5
    (Z1,Z2):0.47

Please help me generate such data in R.

-- 
Sourav Ghosh
2nd Year M.Stat. Student
Indian Statistical Institute, Kolkata
India

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