Questions tagged [moran-index]
Measure of spatial autocorrelation
25
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0answers
11 views
Derivation of Mean and Variance of Moran's I Statictic [closed]
Does anyone have any insight on the actual derivations of the Expectation and Variance of I.
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0answers
29 views
Find optimal distance band after running Incremental Global Moran I with PySAL?
My observations are points along a transect, irregularly spaced.
I aim at finding the distance values that maximize the clustering of my observation attribute, in order to use it in the following ...
3
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1answer
67 views
Defining strength of Moran's I
I have calculated Moran's I in R and reject the null hypothesis in both data sets, there is evidence of strong spatial autocorrelation.
However, how do I compare the two?
First set:
Moran I ...
2
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1answer
58 views
Fixing colors of LISA Cluster maps from Pysal?
I am using the LISA Cluster package from Pysal to create a LISA (Local Indicator of Spatial Autocorrelation) map.
As the example of the documentation shows, the color lightblue is used to identify ...
0
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1answer
63 views
What does first requirement for LISA statistic mean?
According to Anselin, a LISA statistic have to satisfy two requirements:
The LISA for each observation gives an indicator of the extent of significant spatial clustering of similar values around that ...
1
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1answer
132 views
What unit is returned by the ncf::correlog function?
I'm using the correlog function from the ncf package to figure out the distance between points at which spatial autocorrelation isn't detected. I was wondering what unit was being returned in the ...
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17 views
Meaning of required parameters for Morans I of raster in GRASS
I have used the Polygon to Raster tool in ArcGis a convert a vector inside shape file to a raster in TIFF format using one of the vector attributes
Using
https://grass.osgeo.org/grass76/manuals/...
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0answers
60 views
Computing Moran's I for vector data in GRASS
Does GRASS allow for computing Auto-Correlation using Moran's I statistic from vector files. GeoDa and ArcGis can do this. But seems grass lacks this functionality
https://grass.osgeo.org/grass76/...
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1answer
72 views
Calculating Moran's I for buffers of forest cover?
I'm trying to figure out if buffers I have created in ArcMap (measuring percent forest cover in a 1 km distance from a land use map within the buffer) around points at which I will be collecting ...
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0answers
26 views
Understanding Local Moran's I Maps?
I want to better understand the local Moran's I chloropleth maps which show areas (zones) as either in high-high, high-low or low-low clusters.
As I assume the "high"/"low" is just relative to the ...
2
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1answer
417 views
Compute Moran's I on more than one attribute
I am trying to compute global Moran's I to check for spatial autocorrelation among areas of a city. I am using python, in particular geopandas and pysal.
My geodataframe looks like:
District_name|...
1
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1answer
76 views
Geographically Weighted Regression with overlapping polygons
Is it statistically correct (or possible at all) to calculate a spatial regression with (partly) overlapping spatial areas?
I have market areas as the spatial unit with different sociodemographic, ...
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1answer
294 views
Moran's I: Selecting the best option for conceptualizing the spatial relationship between # births & county locations
I'm using Moran's I to see whether there are clusters of births rates present among the 83 Michigan counties, and, if so, whether the clustering is statistically significant.
The inputs are the ...
-1
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1answer
156 views
Output feature missing when using Cluster and Outlier Analysis (Anselin Local Moran's I) in ArcMap?
I am currently working on a project which I must calculate Anselin Local Moran's I. I am using polygon features and ArcMap 10.4.1. Here is my problem: when I am trying to run the command ArcMap shows ...
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0answers
419 views
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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2answers
1k views
Moran's I on 2D arrays/rasters?
I would like to apply Moran's I spatial auto-correlation measure to 2D arrays or raster files in Python and I am wondering if there is an available implementation for it.
I know Pysal offers an ...
2
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1answer
1k views
Choosing value of Moran's I to say existence of spatial correlation?
I am a GIS beginner. Usually we use Moran's I to evaluate spatial autocorrelation. Everyone knows the Moran's I coefficient ranges from -1 (uniform) to 1 (clustering); I = 0 means no correlation.
If ...
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2answers
365 views
Moran test results - rejection of H0
I started with a linear model (lm) and I want to make some spatials models so I tried first a Moran test to lm.
Can we reject the null hypothesis with a p value of 0.11 in order to continue working ...
4
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1answer
882 views
Spatial weight for PySAL from a geojson file or geodataframe?
I want to calculate the Moran I value of a geojson file through python. Recently I am trying to use pysal and I find that I need to get the a spatial weight to realize it. But from the official guide ...
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1answer
724 views
Why Spatial autocorrelation (Global Moran's I) is producing a p value of 0?
I am undertaking spatial autocorrelation (Global Moran's I) in ArcMap 10.3. The p value returned is 0, does this just mean its extremely significant or is this an incorrect result?
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0answers
386 views
Why are Moran's Index calculated in GeoDa and ArcGIS different? [closed]
I recently have found that the Moran's Index calculated in GeoDa and ArcGIS are different based on the same data and the same spatial matrix.
For example, this is my testing shapefile, a point ...
3
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0answers
847 views
Calculating spatial autocorrelation of raster values?
R is perfectly willing to compute a Moran's I statistic (and probably all of the other autocorrelation metrics) for a raster. As best I can tell, PySal and ArcMap's autocorrelation tools specifically ...
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1answer
797 views
Significance test for local Moran's I in R raster
Does anyone know how to produce the p-value and z-scores in order to do a significance test in the local Moran's I values obtained by the following code?
The input is a remote sensing image:
The ...
1
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1answer
557 views
Interpreting GWR Result - Issue
I used the Geographically Weighted Regression (GWR) to find out which independent variables lead to crime and how they vary over the space.
After a literature review, I ran a global Ordinary Least ...
15
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2answers
5k views
Regression Model and Spatial Autocorrelation
I have used OLS and GWR for validating the dependencies between two distinct database. The Residual Square for GWR is 0.82 and thereby making it the right regression model to be used for determining ...
