Questions tagged [spdep]
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29
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spdep::localmoran How to access classified cluster values?
I am trying to get a LISA cluster map similar to this one, eg showing the 'High-high', 'Low-Low'.. cllassified values.
But, I can't figure out how to extract this classifications from the ...
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10
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Regression model where N is greater than number of polygons
I'm trying to construct an analysis where 100 users record data for each polygon in the map below, a total of 17 values per user. Using the values from each polygon, I wanted to generate a model that ...
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44
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Combine neighbors lists while estimating a spatial lag model with multiple time periods with R
I am trying to estimate a spatial lag model for a dataset of U.S. school districts with four years of data. The issue is that the dimensions of the school districts change every year (i.e. the ...
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72
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LISA clusters present very different values for the Low-Low quadrant. spdep x rgeoda
I am performing an Local Moran LISA clusters analysis using R package spdep. In some moment I compared the results with rgeoda package. OK if has some differ between them, different implementations, ...
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79
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poly2nb {spdep} how identify if two cities are neighbours
I'm trying to identify if two cites are neighbours using spdep::poly2nb function, but it returns a list with numbers that i can't understand.
For example,
shp_ce <- rgdal::readOGR(dsn = "...
- 113
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40
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Spatial neighbors to voxels for R-INLA
I am working on an fMRI dataset that I want to analyse using a Bayesian spatial model in R-INLA. I extracted the coordinates for all these voxels. (See the image to get an impression one such a ...
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2
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219
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Applying Moran's I across columns
So I find myself needing to apply global Moran's I across ~20 variables (as in ~20 instances of univariate autocorrelation for each variable, not attempted multivariate spatial autocorrelation). I'm ...
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533
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Calculate sum/average of variable within each group of neighboring counties using R
I am trying to calculate the sum and/or average value of a variable for each group of neighboring counties in the US. I realized this needs at least two steps:
For every county, find the set of ...
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495
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KNN for spatial data and two sets of coordinates
I'm trying to estimate an average value of distances to K nearest neighbors. I have two sets of coordinates and I'm trying to estimate the average distance from each point in one set of coordinates to ...
- 43
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554
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bivariate LISA in R [closed]
I am new to R. I am interested to estimate Moran's I result. Specifically, a map of the bivariate spatial correlation (bivariate LISA) in R using spdep and ggplot2 package. I have points data over ...
user203832
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280
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Moran's I statistical significance with spdep mc.moran function
I would like to obtain Moran's I estimation together with its p-value from a raster data layer --which has na value-- including a figure showing the simulation distribution by mean of spdep::mc.moran()...
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570
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Ignore NAs when getting lagged values in spdep
I'm trying to replicate a study on gentrification of neighbourhoods and I'm dealing with some missing values of mean rent and selling prices for some neighbourhoods. Since these values are very ...
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783
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How to assign a neighbour status to unlinked polygons
This question is, in part, a follow up to: https://stackoverflow.com/questions/57269254/how-to-impute-missing-neighbours-of-a-spatial-weight-matrix-queen-contiguity
I have a .shp similar in structure ...
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Simple KNN for spatial data
I try to find an example to estimate an average value associated to a coordinate, with K nearest neighbors. I found this very help tutorial regional smoothing.
This code can find the k nearest ...
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526
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Problems with adjacency matrix with poly2nb in R
I am working with a shapefile of Ohio precincts, with the hope of performing areal regression models (probably BYM2). To build the adjacency matrix, I used poly2nb from the spdep package. As a double-...
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28
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On the calculus of joint-count test on no-full grid
I have a data points of presence-absence records and I want to perform joint-count test as it was suggested in the post https://gis.stackexchange.com/a/388939/178392 by calculating it on a grid (...
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196
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On the calculus of the variable "autocov" from spdep package
I’m facing a spatial autocorrelation problem and I want to calculate the « autocov» covariate through the function autocov_dist from spdep package. The problem is when I defined the neighborhood ...
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288
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Spatial neighbors in ggplot2
I'm trying to make a space plot with ggplot() as indicated here, but I'm having trouble using the nb2lines() function.
.shp files are here
Error in if (!is.na(projargs) && !nzchar(projargs)) ...
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1
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1k
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Moran's I z-value in spdep
I wish to incrementally find the neighbour distance which maximises Moran's I test statistic. I have read that the I values are not comparable across varying spatial weight matrices but that the z-...
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2k
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poly2nb {spdep} not identifying neighbours correctly
I am trying to do some spatial generalised linear mixed models for areal unit data with the CARBayes package. As part of this, I need to identify the polygon neighbours into a neighbour list using ...
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382
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How to convert coordinates to shapefile with R package's dataset?
I need construct spatial weight matrix for data which syear=1995 (house$s1995==1)in housedataset in spdeppackage,So I tried writeOGR function as the link suggeust to get shapefile enter link ...
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240
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The slot for "plotOrder" comes up as 1 instead of a vector with length specific to my data
My goal is to find neighbors from my SpatialPolygons object using the poly2nb() command from the sp package in R.
This is my code thus far:
p <- s_gis %>%
select(long, lat) %>%
...
- 3
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399
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How do you find the appropriate spatial weight to use for a spatial analysis? [closed]
I am currently about to run a spatial regression (OLS, Lag, Error etc) for my dataset. My dataset contains 1000 randomly generated points throughout the utilisation distribution for my animals (so, ...
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694
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LISA (local indicators of spatial association) p values in R versus in Geoda
When calculating LISA statistics in GeoDa versus using the localmoran() function in spdep, the I values are nearly the same, but the p values can be quite different.
I know the two programs calculate ...
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12k
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Merge spatial and non-spatial data and create SpatialPolygonsDataFrame in r
I am trying to merge non-spatial data (data frame in R) and spatial data (SpatialPolygonsDataFrame in R) and eventually create the merged file in SpatialPolygonsDataFrame form.
In specific, I ...
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502
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Out-of-Sample predictions with spdep::sarlm
I am trying to make an out of-sample-prediction for spatial data using the spdep package. The documentation claims that this should be possible. However, I do not understand how it works. In ...
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687
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Spatial weight matrix with boundary effects in R?
I need some help to finalize code for a spatial weight matrix that uses a nearest neighbor definition within regions, but does not allow neighbors from across a political border. For example, ...
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681
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Using errorsalm() from spdep with multilevel data?
I have a dataset that has multiple observations per county, and I am interested in estimating the effect of a county-level variable on individual-level outcomes. I would like to account for adjacency ...
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2k
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Calculating spatial lags per year in R
At the moment I am having some difficulties with calculating a spatial lag in R.
I know how to calculate the lag in space-wide format but am unable to do it in long form, i.e. have repeated ...
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