# Comparing two spatial datasets statistically

Geographic Information Systems## How do you compare spatial distributions?

To analyze the spatial distribution of attribute values (not features itself, but certain attribute values), you can **divide (weigh) the values by distance to neighbors and create a frequency distribution**. You can then compare that against a uniform or random distribution.

## What is the statistical test for spatial distribution?

**Zimmer- man’s test** is a test of spatial randomness, of whether the spatial distribution of a single population is a ran- dom distribution. Perry and Smith’s test is a test for an association between an environmental factor and the spatial distribution of a population.

## How do you compare two data sets?

**When you compare two or more data sets, focus on four features:**

- Center. Graphically, the center of a distribution is the point where about half of the observations are on either side.
- Spread. The spread of a distribution refers to the variability of the data.
- Shape.
- Unusual features.

## How to compare different data sets with different measurements?

One way to compare the two different size data sets is to **divide the large set into an N number of equal size sets**. The comparison can be based on absolute sum of of difference. THis will measure how many sets from the Nset are in close match with the single 4 sample set.

## How do you analyze spatial data?

Typically, spatial analysis consists of five key stages: **understanding your goal, preparing data, choosing suitable tools and techniques, performing the research, and estimating results**. So, first of all, it is important to figure out what you are interested to know.

## How do you compare two distributions statistically?

The simplest way to compare two distributions is **via the Z-test**. The error in the mean is calculated by dividing the dispersion by the square root of the number of data points.

## What are the 3 types of spatial distribution?

Depending on the answers to these questions, three spatial distributions are generally found: **a so-called completely random distribution, an aggregate and a regular distribution**. An example of these three theoretical distributions is shown in figure 4.6.

## What are the 5 concepts of spatial analysis?

Six types of spatial analysis are **queries and reasoning, measurements, transformations, descriptive summaries, optimization, and hypothesis testing**.

## What are the 4 statistical tests?

Quote from video:

## What is the best way to visually compare two distributions?

The usual way to compare data distributions is to **use histograms**. One technique is to display a panel of histograms, which are known as comparative histograms.

## What should you look for when comparing distributions?

The most common way to compare three or more distributions is with boxplots. Things to look at are the **medians, interquartile ranges, and outliers**.

## How do you match spatial references?

In your ArcMap TOC, right-click the data frame name name (which is Layers by default) and click Properties. On the Data Frame Properties dialog box, click the Coordinate System tab. In the upper window of this dialog box, expand the Layers folder and select the layer you want to match. Click OK.

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