Questions tagged [statistics]

Collecting and analyzing numerical data or making numerical summaries of data.

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2answers
456 views

Problem opening JP2 image using GDAL (interaction of -stats and -hist flags)

I came across unexpected GDAL behaviour while working with Sentinel-2 data granules. The Sentinel data should have values between 0 and 10000 when opened correctly. However, I have noticed that when ...
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1answer
381 views

Why doesn't Dissolve with stats plugin work in QGIS 2.14?

In ArgGIS 9.3 there is a function of ArcToolBox named Summary Statistics (Analysis). I'm finding a similar function on QGis. One of these is Dissolve with stats (plug in) but on my version of QGIS (...
1
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1answer
603 views

Is there a stats dashboard on cartoDB (now carto)

I've been looking for an overview of map stats (how many views etc) on cartoDB (now carto). All I can find is the bar charts for each map in the gallery. Is there a page on the site that brings these ...
1
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2answers
249 views

Do integer values in a Confidence Raster correspond with a specific probability %?

I have been using the Maximum Likelihood Tool (Spatial Analyst extension, ArcMap 10.3.1) to classify a number of rasters into "Vegetation" and "Bare Ground" classes. I'd like to have some sort of ...
0
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1answer
572 views

Finding field with maximum value and field name using ArcPy cursor?

I was wondering if an equivalent of summary statistics exists for finding such statistics across fields rather than records in a table. For example, of several fields, I wanted to find which one has ...
3
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2answers
156 views

ArcGIS: table statistics range, method?

I have the following table with distance values (NEAR_DIST) after using the "Near" tool in ArcGIS: I am looking for a method of getting the following statistical information/statement, for example: "...
2
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1answer
63 views

An equivalent for field statistics for records

I know how to obtain various statistics for a field, or "column", in an attribute table in ArcGIS. Is there any way to obtain a Mode figure for records, or the "rows" in a table? For instance, an ...
2
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0answers
50 views

Aggregating census tracts and reducing Coefficients of Variation?

I am working on a project that maps out poverty rates (ACS data) by census tract. Many of the tracts have CV's that are just too high for our study and I am hoping for find a sound methodology in ...
2
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1answer
80 views

Concerning “Error when using r.series in a python script”

Based on the "Error when using r.series in a python script" discussion (Error when using r.series in a python script) and based upon the solution given by Joseph I tried to make the same but by using ...
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0answers
242 views

Summary statistics from feature iterator and select by location - missing selected feature name. Arcmap 10.2

I'm trying to calculate summary statistics for a subset of a point feature, based on selecting by location. I'm using a feature selection iterator to get statistics for each polygon feature in the '...
0
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1answer
30 views

Function to report all polygons and their data within another polygons?

I have a layer with different types of vegetation and another layer with estates. Is there a function in ArcGIS 10.3 to create a report of each estate where it lists what It finds on a selected estate?...
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0answers
131 views

Per-pixel Descriptive Statistics through multiple Raster layers

I'm looking for computing different descriptive statistics through a set of raster layers. I need to make it with a python script capable of running into a standalone tool within the QGIS. To do so ...
2
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1answer
1k views

Summarising an attribute from point layer in polygons with FME

I have a number of polygon feature sets and a point layer containing an attribute with population count. I want to summarise the population attribute for all points within each polygon feature set ...
4
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1answer
385 views

Quartiles from Raster Layer band

I'm building a plugin from QGIS, and I need to extract the values from the quartiles from a band in a raster layer. Does anyone knows how it is done?
2
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0answers
38 views

Basic statistics function on certain attributes stops at 6% on certain layer in QGIS?

I am trying to use the basic statistics function in QGIS on an attribute in a vector shapefile but it reaches 6% and then gets stuck and does not load anymore. It works fine on other layers/other ...
0
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1answer
651 views

What is (if there's any) difference between MAUP and Edge Effect

I heard both the term MAUP and Edge Correction in association with Spatial Statistics, zoning/quadrats, demographics etc. Is there a difference between the two? What is the difference then?
1
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1answer
112 views

Average Nearest Neighbor does not have all the options

I have a point feature class that I used the Average Nearest Neighbor from the ArcGIS software to calculate the pattern. ArcGIS produces output chart that says whether the data is dispersed, random ...
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2answers
1k views

Creating quadrats in ArcGIS

Is there a tool / toolbox in ArcGIS to create quadrats on a population? I have a point feature classes with 1 billion points (divided to 10 almost equal feature classes) that I want to take samples ...
0
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1answer
72 views

Average Nearest Neighbor tool extreme restuls for different area?

I'm using the "Average Nearest Neighbor" tool in ArcGIS 10.3 to calculate whether my point feature class is clustered, random or dispersed. One of the parameters is area. I tried putting different ...
1
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1answer
455 views

Graphic output for Ripleys K function

I am using ArcGIS to calculate Ripleys K function using the "Multi-Distance Spatial Cluster Analysis (Ripleys K Function)" tool on a point feature class. I can see a table output but want a graphical ...
1
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1answer
175 views

How to work with Spatial Autocorrelation (Morans I) on equal weighted point

I have a point feature class. All points are the same, it's not weighted. I want to use Spatial Autocorrelation (Morans I) tool but it only takes a field for weight. I tried fooling it by adding a ...
3
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3answers
346 views

How do I calculate average in my field calculator within specified limit?

I would like to calculate the average, max and min of each trips that I have. Each trips are also predefined (e.g. Trip 1, Trip 2) in the attribute table. (As below). I have more than 2000 trips. ...
3
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1answer
1k views

Calculating summary statistics and access resulting value in table using ArcPy?

With arcpy, I want to calculate the mean value of a specific field in a shapefile and print the resulting value for the user. I use the Summary Statistics tool and it works, but the resulting value ...
3
votes
1answer
364 views

Table of statistics of rasters input in QGIS

I work with QGIS GDAL,I have many raster image 'geotiff' with one band for many dates, I want to create a table that contains statistics for all rasters that I have. I tried the algorithm 'raster ...
1
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1answer
86 views

Correlating raster layers

I am trying to correlate contaminant data with other variables. For instance I want to see if high values of contamination coincide with topographic lows in my elevation raster (DEM). All the layers ...
5
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2answers
885 views

Retrieving LiDAR metrics from relative vertical layers of point cloud?

I need to obtain the proportion of all returns within 5 equally spaced height bins between the cutoff (1 meter) and the maximum height value. I need to get this proportion of all returns for 1000 ...
1
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1answer
573 views

Identify the top 10% of raster cells

I have a raster with different risk values for a hazard. How can I identify the top x% (eg. 10%) of the raster cells with the highest values within ArcGIS?
1
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1answer
45 views

Replace Statistics_analysis with SearchCursor?

I'm using ArcGIS 10.3, 64bit with an advanced license. I have the following code, that runs just fine. It goes through a table that contains a large number of entries with zip-codes and population ...
7
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2answers
529 views

How to automatically sum up values within buffers?

I want to establish the population figures within multi-ring buffers around certain site. I have set up the buffers and am running a select by location query on each concentric ring. Once the ...
1
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1answer
550 views

How to perform statistical test for two sets of points?

(I have asked this question originally on Cross Validated; however, no good answer and someone suggested me to ask the question here). We know that we can perform statistical test (e.g., t-test) for ...
0
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2answers
68 views

More information from Summary statistics tool in ArcGIS

I try to find the MAX value for every distinct element in a dataset (I done this using MAX in summary statistics) but I also want to have the id of the element corresponding of that MAX in my output ...
1
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1answer
265 views

Calculate the frequency of classes of neighbouring raster cells

I'm struggling with a problem when working with a raster dataset of biotope types: For each cell I would like to find out the frequency of classes in the adjacent cells, e.g. from the 8 neighbouring ...
2
votes
1answer
80 views

Performing Statistics operation on field in Attribute table?

I am working with the Shapefile consisting set of points. One of its field (let's call it X) contains numeric data, ranging from 0 to 1. In order to find out the average value of field X, I opened ...
3
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2answers
431 views

Passing in complex parameters to geoprocessing tool?

I'm currently using the Statistics geoprocessing tool (called Summary Statistics in the UI) from ArcObjects. This tool accepts two "complex" (for lack of a better term) arguments: Case fields ...
3
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1answer
313 views

Extracting NDVI using QGIS from multiple images to Excel?

I created 25 images in QGIS. Each image has different information about the NDVI of the area. How can I extract mean, max, and min information about the NDVI from each image and put it in Excel?
1
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1answer
83 views

extracting statistics from a raster within the extent of a polygon

I have a polygon representing the extent of a study area. This polygon is overlaid to a raster representing the quality of land, which is classified into 5 classes (from bad [1] to good [5]). I would ...
2
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0answers
96 views

Statistically comparing surface slope of 2 different areas? [closed]

I could use the statistical tests like t-test and ANOVA, however I am afraid those test will easily show significant differences if I use the slope values of all cells from each area.
6
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2answers
3k views

how to get max and min from a raster using arcpy?

I have a land surface temperature raster file and I want the max and min of it. minLSTresult = arcpy.GetRasterProperties_management(raster_result, "MINIMUM") minLST = minLSTresult.getOutput(0) ...
3
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1answer
2k views

Finding Median, Max and Min values from Raster Layers in QGIS

I currently have 10 years worth of January raster datasets (working on just one month at the moment) of cloud fraction cover from MODIS, and am trying to create new 3 separate rasters which will give ...
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2answers
225 views

Error Trying to Run R Summary Statistics in QGIS 2.12.1

When I try to run the R script "Summary statistics" in QGIS 2.12.1 on a Windows 7/64 bit machine, I get the error message "error in if (!file.info(DSN)$isdir) DSN missing value where TRUE/FALSE needed,...
0
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1answer
905 views

Calculate percentages with field calculator in arcgis?

I am trying to calculate the percentage of each the area of each polygon in the selected area. I tried using ( math.fsum(!shape.area!) / !PolygonArea! )*100 and other codes but I cannot make it work. ...
1
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1answer
389 views

Cell Statistics failing to read rasters in list

Heyo. I'm trying to get the rasters from a list (about 32 rasters) and then sum them up with CellStatistics in arcpy. I'm using Python 2.7.8 and ArcGIS 10.3.1 I got it to work the first time around ...
10
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1answer
4k views

Calculating spatial correlation between features from two separate layers in QGIS

I am trying to determine whether the presence of large numbers of active duty military troops in an area is spatially correlated with higher/lower levels of violent crime. That is, are the areas ...
2
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1answer
154 views

Resampling gives higher MEAN when using zonal statistics

I am using ArcGIS 10.1 for Desktop. I have a value raster and a polygon feature in GCS coordinates. My raster resolution is 0.5 decimal degrees which is much larger than the size of my polygons. My ...
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0answers
288 views

Explaining different results from Ordinary Kriging and Universal Kriging?

When using either methods to create a surface from the same set of observations, these surfaces differ from each other. Visually it can be seen in the differences of the following contours (...
3
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2answers
839 views

Generating DEMs from point clouds and differencing them?

I have two point clouds obtained via structure from motion (ground photos of sand-dunes + Visual SfM/Agisoft Photoscan). If I wanted to generate a DEM from these point clouds and difference them to ...
2
votes
1answer
266 views

How to separate out bands from hyperspectral data using R

I'm having one hyperspctral data with 426 bands, with dim 250*250*426. I want to seperate each bands. I tried like this img <- stack("name.tif") rr <- array(, dim= c(250,250,426)) for(i in 1:...
2
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3answers
246 views

How to show statistically significant incident locations

First let me preface with I tried to search for this solution first but I don't really know how to word it and could not find any results so excuse me if this is a duplicate. I would like to know how ...
1
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0answers
39 views

Statistical bias arising out of only comparing US census block groups that have not changed (been split) over time?

Census Block Group ("CBG") study areas are notorious for changing over time. Even from 2009 to 2013, about 10-25% of the CBG's in South Carolina have not remained consistent over that time. Seeing ...
24
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3answers
4k views

Major bug in ArcGIS Zonal statistics?

Update: The bug has been fixed in the ArcGIS 10.4 release I am using ArcGIS 10.2.2 to determine zonal statistics for a number of zones. If there is any NoData in the value raster, I want the zone ...