Hey can someone tell me how log returns are calculated? I understand its Log(future value/value). But I dont understand what base I should use. For example on the link below it has it such that the future value is 110 and the current value is 100. However, log base 10 is 0.04 not the value they have which is 0.09. What am I doing wrong? http://www.riskglossary.com/link/volatility.htm Thanks.