Hi,
I'm trying to find the confidence interval for monthly investment account balances. I have calculated the mean and the standard deviation, however if I subtract 2xSD from the mean, the result is a a negative number. Given that the account holds long positions only, it's value cannot be negative. I'm wondering how would one then go about determining the confidence interval for such data. Just imposing a hard lower limit of zero while keeping the upper limit does not seem right. I'd appreciate any input on this.
Regards,
Houman
I'm trying to find the confidence interval for monthly investment account balances. I have calculated the mean and the standard deviation, however if I subtract 2xSD from the mean, the result is a a negative number. Given that the account holds long positions only, it's value cannot be negative. I'm wondering how would one then go about determining the confidence interval for such data. Just imposing a hard lower limit of zero while keeping the upper limit does not seem right. I'd appreciate any input on this.
Regards,
Houman