Hi everyone,
I am new to R and keep getting the message
Error in as.vector(x, mode)
while trying to run nlsystemfit.
Below is my exact code. The data is in Stata format because I only
recently swapped to R and am trying to compare results from Stata to
make sure I know what is going on.
I have searched google and read sever R-help articles with this error.
They all say the problem is to do with attach(). I haven't used
attach() as far as I can tell. However it does seem to be a problem
with reading the data. I sometimes get a problem with "masking".
Finally, when I ran the example in the systemfit documentation for
nlsystemfit everything went fine. The major structural difference I
can see between the codes is they use data() where as I do not.
Any advice would be truly appreciated.
library(systemfit)
library(foreign)
auto74 <- read.dta("auto74.dta")
eqWeight <- weight ~ a0 + a1*mpg + a2*price + a3*trunk
eqLength <- length ~ b0 + b1*mpg + b2*price + b3*trunk
model <- list(eqWeight, eqLength)
start.values <- c(a0=0, a1=0, a2=0, a3=0, b0=0, b1=0, b2=0, b3=0)
nlsystemfit("OLS", model, start.values, data = auto)
Error in as.vector(x, mode) :
cannot coerce type 'builtin' to vector of type 'any'
Kind regards,
Alex Olssen
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