Statistical Analysis Stack Exchange
Statistical Analysis Stack Exchange

Questions tagged [spatial]

The field of study concerning statistical methods that use space and spatial relationships (such as distance, area, volume, length, height, orientation, centrality and/or other spatial characteristics of data) directly in their mathematical computations.

Spatial statistics are used for a variety of different types of analyses, including pattern analysis, shape analysis, surface modeling and surface prediction, spatial regression, statistical comparisons of spatial datasets, statistical modeling and prediction of spatial interaction, and more. The many types of spatial statistics include descriptive, inferential, exploratory, geostatistical, and econometric statistics.

Reference: ESRI's GIS dictionary.

http://support.esri.com/en/knowledgebase/GISDictionary/term/spatial%20statistics

862 questions
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Intrinsic spatial stationarity: doesn't it only apply for small lags?

From the definition of Intrinsic stationarity: $E[Z(x)-Z(x-h)] = 0$ This assumption is used for example in ordinary kriging, instead of assuming a constant mean over the entire space, we assume the mean is constant locally. If the mean is constant…
Kasper
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9
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1 answer

Why do you have to provide a variogram model when you are kriging?

I am very new to spatial statistics and watching lots of tutorials, But I don't really get why you have to provide a variogram model when you krige. I am using the gstat package in R, and this is the example they…
Kasper
  • 3,399
5
votes
1 answer

Interpreting a formula on geographic concentration

The calculation formula of geographical concentration is as follows: $$G=100\times\sqrt{\sum_{i=1}^n\left(\frac{n_i}{N}\right)^2}$$ The explanation of the formula is something I don't understand: In the formula, $G$ represents the concentration of a…
LÜHECCHEgon
  • 153
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Implement an average index of spatial proximity for different groups

I have a longitudinal dataset of (c.a.) 100 observations. Each observation is assigned to a point in space. In each period, each observation is assigned to one out of x groups (i.e. no multiple memberships), where x changes every period. As a…
shazz
  • 133
3
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1 answer

Is there an L-tilde function defined within spatial statistics?

Within spatial statistics, there exists an L-hat function, which to my understanding is a square-root transformed estimate of Ripley's K-function. However, I am trying to understand if there is another form of the L-function, as to my understanding…
user37439
  • 321
3
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1 answer

Testing for group differences based on Ripley's K-function

Given a number of K-functions from data of two populations (e.g. 10 sets with points of population 1 and 10 sets with points of population 2; non-overlapping image areas; only one population per set, so data is not marked), how can I perform testing…
Kardashev3
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Comparing two spatial distributions without computing distance matrices

We have around N=1000 entities but for now consider in the example just seven, labelled 1-7 below. We can lay them out in 2D in D different ways - just two are shown below. I would like to be able to compare these distributions, cluster them and so…
uncoolbob
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Is there any difference between spatial correlation and spatial autocorrelation?

What is spatial correlation? Is it the same with spatial auto-correlation or it is different?
user71913
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How to statistically compare two numerical maps?

I have spatial temperature data on a relative scale from 1 to 0 on several days. The data sets have the same resolution, origin, and extent. How can I statistically compare them? How to identify patterns? What measures could be used to give a value…
Lipsan
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vote
1 answer

convert zip codes to latitude and longitude

I have a data set that includes a list of zip codes. Is there a way in R to convert these zip codes to latitude and longitude coordinates? Thanks!
user9292
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1
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measure of spatial shift

I need some advise on how to quantify the spatial shift of an event. I have current distribution of rice across a large region. Not everywhere in the region is rice present. Then I model this distribution and I project its future distribution which…
89_Simple
  • 981
1
vote
1 answer

Interpretation of Matern cluster point pattern process intensity function equation

I am struggling with interpreting the intensity function for a Matern cluster point process model. From Illian et al. 2008, p. 381 (Statistical Analysis and Modelling of Spatial Point Patterns), it appears that the indicator is summed if a point X…
Andrew L
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vote
1 answer

online resources for spatial analysis

I am wondering about some good online resources for learning how to implement spatial statistical techniques, like Moran's I and Geary's C, or even K Nearest Neighbors...any help is appreciated. Thanks!
Moderat
  • 859
0
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0 answers

test fof relative global impact of latitude and altitude on a variable, should I account for spatial dependence?

I want to test for relative global impact of absolute latitude and altitude on a variable that ranges from 0 to 1 (six possible values). I have thousands of observations sampled across the world. I harbour some doubts regarding doing that test: Do I…
Agus Camacho
  • 570
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Spatial analysis with weights

I am estimating some spatial models. I would like to know if it is possible to include sample weights. In other words does it existna spatial counterpart to weighted least square? I tried to google this but apparently I was not able to find…
Dario
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