Statistical Knowledge Learning
Some record to experiment or read the paper come into contact with statistical methods.
A standard deviation ellipse
Right direction and distribution points were a classical algorithm analysis.
See:
1) God's shrimp blog: https://blog.csdn.net/allenlu2008/article/details/47780405 ;
2) ArcGIS Desktop: http://desktop.arcgis.com/zh-cn/arcmap/latest /tools/spatial-statistics-toolbox/h-how-directional-distribution-standard-deviationa.htm ;
3) ArcGIS Pro: https://pro.arcgis.com/zh-cn/pro-app/tool-reference/ spatial-statistics / directional-distribution.htm
Potential applications
- A set of relationships marked on the map crime trends to determine the distribution and behavior of a particular element (a series of bars or restaurants, a particular street, etc.).
- Marked on the map specific groundwater wells contaminated samples may indicate diffusion of the toxin, which is useful when deploying mitigation strategies.
- Size of the ellipse of the respective races or ethnic regions where shape and comparing overlapping portions may be provided in-depth information related to the segregation or ethnic segregation.
- Within a period of time to disease outbreaks draw an ellipse can model the spread of disease.
- While investigating the association between atmospheric conditions and flight accident, check the height distribution of a certain type of storm is a useful factor to consider.
achieve
- ArcGIS
- Matlab：help mvnrnd
doubt
- WeightedThe calculation of the standard deviation ellipse?
For example, not only a potential application in the case 4, each point represented, but may be a plurality of cases, it should be established how the weighted number of cases with a standard deviation of the ellipse; the same, such as distribution centers and contamination analysis directions, each pollution point represents is different, how to use the degree of pollution weighted?
Second, continued
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