On 01/22/2014 10:03 PM, katerina stavrianaki wrote:
Hello,
My name is Katerina, i am new to R and i am working with the ETAS package.
My goal is to fit the spatiotemporal etas model to an aftershock sequence (
atach file example.csv).I have installed the packages: spatstat, SAPP and ETAS.
By reading the ETAS package manual i saw the data must be in class ppx.
Could you please help me on how to convert my data (example.csv) into class ppx
?
Thank you in advance,Katerina
Hi Katerina,
Your example data didn't make it through to the list, but it seems that
what you want to do is to read that file into a data frame (see
read.csv) and then pass that data frame to the ppx function in spatstat.
Read the help page for ppx to see how this is done, I think that all you
need is the data frame and a vector of data types in the "ccord.type"
argument. It looks like you should only pass those columns of the data
frame that are spatial, temporal or local coordinates, and marks, so
make sure that you know how to specify a subset of columns (e.g.
df[,c(2,4,5,6)]) if you have other information in the data frame.
Jim
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