		CHANGES IN PhViD 1.02


BUG FIXES

	o fixed the PRR function. 
		There was an error in the formula used for the PRR
		The formula for the variance has also been modified. It is not the one proposed in an Puijenbroek et al. (2002). 
		var[log(PRR)] = 1/n11 - 1/(n11 + n10) + 1/n01 - 1/(n01 + n00)

           	




