On Wed, 26 Oct 2011, Simari wrote:
 I have in excel:
 1. a column with date (13/06/10, 13/07/11 etc....) daily basis
 2. A column with price
 I make the log of data
 I make the OLS from Model and I get this result:
 ^l_Serie_T = 1,62
            (0,00107)
 T = 88, R-quadro = 0,000 
In this regression you haven't included any explanatory 
variable, you just have a constant, hence the R^2 of zero.
Allin Cottrell