= How do I produce random variables which follow a negatively skewed distribution? = Most distributions such as the exponential and log-Normal distributions are positively skewed with the mode of the distribution occurring for lower values. The Weibull distribution is negatively skewed and may be generated [http://www.taygeta.com/random/weibull.xml using random variables which are uniform on the interval [0,1]] The below produces an open ended negatively skewed weibull distribution with parameters, 2 and 20. It has a median of $$ 2 text^{-0.05}((ln(2)text^{0.05}) = approx. 0.95. $$ {{{ compute wrv= (-(1/2)*(ln(1-rv.uniform(0,1))))**(0.05). exe. }}}