Apply Durbin Watson test on Prais Winsten Model

Question

I am having trouble running a Durbin Watson test on the prais winsten model I generated.

value3<-prais.winsten(value1$model)
dwtest(value3)

I receive this error:

Error in terms.default(formula) : no terms component nor attribute

Answer 1

Without any reasonable reproducible example is hard to pinpoint where is the issue, this is a kind of default way to go:

# Calculate Durbin-Watson                                                                         
ols <- lm(y ~ x1 + x2)  

dwtest(y ~ x1 + x2)

prais.winsten.lm(ols)

# Calcuate Autocorrelation and Partial Autocorrelation Coefficients                 
acf(resid(ols),lag.max = 5,plot = FALSE)
pacf(resid(ols),lag.max = 5,plot = FALSE)

Answer 2

You need to call dtest with the lm function on the list that prais.winsten returns

From your example it would be:

dwtest(lm(value3[[1]]))

When you display value3 you should see somthing like this at the top

[[1]]

Call: lm(formula = fo)

This is what I am referring to.