listw spatial weights for panel data

Dear all,

I would like to append a listw object to another listw object such that I
can keep it in its format. The idea is creating a spatial weights list for
countries and years based on cshapes.
Why? Simply appending listw objects will lead to wring indexing, won't it, 
as the listw objects only index 1:n for their sets of spatial 
observations. Your approach will not show how say France 1949 relates to 
Spain 1962 (which should have different indices), will it?

If you need a collection of listw objects, put them in a list, and access 
them from that. This is what is done for multiple lag orders, see ?nblag, 
but there the numbers and indices of spatial observations do not change, 
while yours change over time (Czechoslovakia -> Czech Republic and 
Slovakia). You need to think through the consequences of your 
representation - appending listw objects is not the right question.

Hope this clarifies,

Roger
However, I was not able to combine two
listw objects without turning them into a regular list. Is there any simple
trick or is what I would like to do anyway useless for current spatial
analysis packages (e.g. splm or spdep)? I am relatively new to both R and
spatial analysis and would be happy about any comments!

Jerg

result0 <- distmatrix(as.Date("1950-6-30"), type="capdist", useGW=T)

result0 <- 1/result0

diag(result0) <- 0

result <- mat2listw(result0)

result$year <- 1950

# loop

for (year in 1951:1960) {

  date.current <- paste(year, "6", "30", sep="-")

  result.current <- distmatrix(as.Date(date.current), type="capdist",
useGW=T)

  result.current <- 1/result.current

  diag(result.current) <- 0

  result.current2 <- mat2listw(result.current)

  result.current2$year <- year

  result <- #???#(result, result.current2) }

	[[alternative HTML version deleted]]

_______________________________________________
R-sig-Geo mailing list
R-sig-Geo at r-project.org
https://stat.ethz.ch/mailman/listinfo/r-sig-geo

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

listw spatial weights for panel data

Thread (2 messages)