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2009 Sep 20
2
missing level of a nested factor results in an NA in lm output
...? 0.01 ?*? 0.05 ?.? 0.1 ? ? 1 Residual standard error: 0.4944 on 10 degrees of freedom Multiple R-squared: 0.8004, Adjusted R-squared: 0.4211 F-statistic: 2.11 on 19 and 10 DF, p-value: 0.1133 I then use the estimable function to estimate a linear combination of the parameter estimates. myEstimate <- cbind( '(Intercept)' = 1, 'GROUP1' = 1, 'FEATURE4227:GROUP1' = 0.5, 'FEATURE6374:GROUP1' = 0.5, 'GROUP0:PATIENT2' = 1 ) rownames(myEstimate) <- "test" > estimable(fit, myEstimate) Estimate Std. Error t value DF...
2013 Jan 06
0
fPortfolio-portfolio optimization
Hello everyone, I have been spending many hours on a seemingly simple portfolio optimization problem using the package fPortfolio. My optimization problem is slightly different than a standard one such that I have a known set of asset returns. My problem is how to collect this information into my functions and pass them onto the optimization function. I have written my own covariance estimation