public LogNormal(double mu, double sigmaSquared) throws ParameterException {
		if (sigmaSquared <= 0) {
			throw new ParameterException("LogNormal parameters mu in R, sigmaSquared > 0.");
		} else {
			this.mu = mu;
			this.sigmaSquared = sigmaSquared;
			norm = new Normal(mu, sigmaSquared);
		}
	}