GWAR - R
On Sun, 25 Sep 2011, Inaki Sagarzazu wrote:
Hi Roger Thanks for your response. I am not sure why there can't be polygons with missing info. Is it something with the model or the estimation?
You cannot fit a linear model with missing info either, those cases get dropped.
Also, How can I drop the NA's from a shape file in R? I've tried but can't seem to be able to do it.
Assuming that the data only contain variables that are relevant for the model, create a logical vector and subset in the usual way: cc <- complete.cases(as(myshp, "data.frame")) myshp_cc <- myshp[cc,] If there are other unused variables with NAs that may lead you to drop more observations than necessary, create a new object with only the relevant columns first: names(myshp0) myshp <- myshp0[, c(1,3,5,7)] if c(1,3,5,7) are the variables you want - you can use names in a vector too. Hope this helps, Roger
Thanks Inaki On 24 Sep 2011, at 08:27, "Roger Bivand" <Roger.Bivand at nhh.no> wrote:
On Thu, 22 Sep 2011, Inaki Sagarzazu wrote:
Hi, I am trying to use gwr in R but I'm having problems because some of my polygons have missing values (NA) for the variables of interest. Do you have any suggestions on how to solve this?
If data is missing in the response or covariates, all bets are off. You could drop those observations, or incomplete variables. You could try to impute the values, but then standard results would not hold downstream. Roger
thanks --------------------------------------------------------------------------------------------------------------- I?aki Sagarzazu, PhD Research Officer Nuffield College University of Oxford OX1 1NF Oxford United Kingdom Office: 44 (0) 1 865 614990 Inaki.Sagarzazu at nuffield.ox.ac.uk http://www.inaki-sagarzazu.com
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-- Roger Bivand Department of Economics, NHH Norwegian School of Economics, Helleveien 30, N-5045 Bergen, Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43 e-mail: Roger.Bivand at nhh.no
Roger Bivand Department of Economics, NHH Norwegian School of Economics, Helleveien 30, N-5045 Bergen, Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43 e-mail: Roger.Bivand at nhh.no