# 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.

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### Orthogonal basis functions in mgcv

I have a spatial dataset that I'm modeling using penalized splines from mgcv. Here's a simplified example of what it looks like: For simplicity, I'm modelling some ...
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### Model choice - Spatial Binary output [duplicate]

I'm just looking for ideas for this. Say we want to predict the presence of a certain "thing" in a country by each postcode - let's take the UK, so there could be around 1.7 million ...
0answers
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### Spatial point pattern modelling where the observation of points are uncertain?

I am wondering if there is any literature on this issue. My problem here is not regarding the location uncertainty of the points, it is rather that I am not sure if a point is indeed an event ...
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### Spatial change-of-support from coarser areas to smaller, nested areas

I'm working with survey data and for $N$ larger domain units (in this case, spatial) I have an estimate of some response variable $y_i$ and covariate vector $x_i$ for $i\in \{1,...,N\}$. In each of ...
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9 views

### spatial correlation between two hexa/density maps

I was working on a report and was faced with a question regarding maps and spatial analysis. I want to compare some maps and find the similarities/differences among them. The maps represent the sum of ...
0answers
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### How to correct spatial autocorrelation with glmmTMB when there are several observations on sites?

I have a large dataset of several species' activity parameters during nights and I want to account for spatial autocorrelation (tests and graphs show that my models suffer from it). However, I cannot ...
0answers
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### Dealing with outliers when calculating body condition indexes

I am seeking advice on how to deal with outliers when trying to calculate residual body condition indexes (by using the residuals from a regression of body mass with body length). I am using a body ...
0answers
7 views

### What is an appropriate null model for a GAM with spatial autocorrelation fit using mgcv::gamm?

I am interested in comparing the fits of various general additive models to a dataset with strong spatial autocorrelation using the R package mgcv. There are no ...
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10 views

### Knowing when to stop with spatial point thinning — is an approach with Clark-Evans test valid?

I need a random sample of presence points from the species' area to use in distribution modeling. I have an excessive amount of spatially clustered presence records, so I use minimum nearest neighbor ...
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18 views

### Is Nearest Neighbor Distance Ratio (NNDR) test good for assessing point pattern?

Regularity of point pattern is routinely checked in ArcGIS with the Nearest Neighbor Distance Ratio test providing significance estimations: https://pro.arcgis.com/en/pro-app/latest/tool-reference/...
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15 views

### Compare Moran I at different time periods

Consider the case of X agents distributed in a geographical space. Their number and spatial position is fixed over time. However, their characteristics change from one time to another. I can compute ...
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### Spatial Regression using PROC GLIMMIX

I'm experienced using PROC GLIMMIX, but I don't have expertise in spatial analysis. I have data that is at the FIPS (county) level. I'm interested in running a negative binomial regression model using ...
0answers
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### Nagelkerke pseudo R^2 interpretation in spatial regression

Could anyone explain to me the interpretation of Nagelkerke pseudo R^2 in spatial regression models? Definitions say it is computed using some conditonal probability, but I didn't quite get what they ...
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### What distance measure should be used to cluster (A - B) where A and B are correlation matrices?

I have 2 conditions with $m$ variables: Treatment = $X_A$ Reference = $X_B$ I've calculated the pairwise correlation of each condition to have 2 $m x m$ correlation matrices I'm calling: Treatment ...
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### min-max-normalized spatiotemporal matrix?

I am using time-series cross-section (TSCS) data and I will like to estimate the following model. $y_{i,t}=\alpha+ \beta \sum_{j=1}^nw_{i,j,t}y_{i,t}+ \varepsilon_{i,t}$ Where $y_{i,t}$ denotes the ...
1answer
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### Conditional posterior distribution of coefficient in logistic regression

I would like to derive the conditional distribution of β in a logistic regression where Y follows a Binomial distribution B(n,p) the probability model is given as: logit(p)=X'β +u+v ; u is spatial ...
1answer
23 views

### Diagnostics of spatial regression residuals in R

I fitted multiple spatial regression models - spatial lag model, spatial error model and spatial durbin model. My question is, how do I check the assumption of normality on errors? In classical linear ...
1answer
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### What algorithm to use to classify image-like data by spatial relations?

Let's assume I have dataset of image-like 2D samples where values can be divided into few discrete levels (for example 1, 2, 3 and 4) like in the image below, where each color maps different value, ...
1answer
25 views

### Testing difference intensity regions of multiple images - GAM?

I am trying to model the difference between the pixel values of two regions in a set of images. Each image is different and contains the pair of regions. My question is about how to take into account ...
1answer
36 views