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The ruGarch Package & Insignificant estimates
2 messages · Benny André Byremo, Alexios Ghalanos
You have 3 options: 1. Fix the parameter which is not significant to zero and re-estimate e.g. ma1 "setfixed(modelspec)<-list(ma1=0)" The documentation on ugarchspec explains the naming of the parameters. 2. Change the ugarchspec to exclude the parameter from estimation. 3. Automatically have the program zero the parameters outside a certain p-value threshold and re-estimate the model using the 'reduce' method: e.g. given an estimated model of class uGARCHfit (e.g. 'mod') newmod = reduce(mod, pvalue=0.1) At present, the danger of using the 'reduce' method is that it will zero the GARCH intercept if it is not significant. I will update this to instead set it to its variance targeting value in the next update. -Alexios
On 03/12/2013 02:58, Benny Andr? Byremo wrote:
Hello I hope somebody have time to answer me on a question related to the ruGarch package. I have fitted a model , but one of the estimates is insignificant and I want to estimate the same model once more without including this estimate. What should I type to make this happened? I have consulted the package pdf and googled it but without luck. The code I used: modelspec <- ugarchspec (variance.model = list(model = "gjrGARCH", garchOrder = c(1,1), submodel=0 ), mean.model = list(armaOrder = c(0, 1), include.mean = T), distribution.model = "norm" , fixed.pars=list()) modelspec at model$parsmodelfit <- ugarchfit(spec=modelspec, data=rn)show(model fit) Greetings [[alternative HTML version deleted]]
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