# geodetector
Spatial stratified heterogeneity (SSH), referring to the within strata are more similar than the between strata, a model with global parameters would be confounded if input data is SSH. Note that the "spatial" here can be either geospatial or the space in mathematical meaning. Geographical detector is a novel tool to investigate SSH: (1) measure and find SSH of a variable Y; (2) test the power of determinant X of a dependent variable Y according to the consistency between their spatial distributions; and (3) investigate the interaction between two explanatory variables X1 and X2 to a dependent variable Y.
To install the stable version from CRAN:
```
install.packages('geodetector')
```
### References
Wang JF, Li XH, Christakos G, Liao YL, Zhang T, Gu X & Zheng XY. 2010.[Geographical detectors-based health risk assessment and its application in the neural tube defects study of the Heshun region, China](https://doi.org/10.1080/13658810802443457). International Journal of Geographical Information Science 24(1): 107-127.
Wang JF, Zhang TL, Fu BJ. 2016.[A measure of spatial stratified heterogeneity](https://doi.org/10.1016/j.ecolind.2016.02.052). Ecological Indicators 67(2016): 250-256.
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空间分异是自然和社会经济过程的空间表现,也是自亚里士多德以来人类认识自然的重要途径。地理探测器是探测空间分异性,以及揭示其背后驱动因子的一种新的统计学方法,此方法无线性假设,具有优雅的形式和明确的物理含义。基本思想是:假设研究区分为若干子区域,如果子区域的方差之和小于区域总方差,则存在空间分异性;如果两变量的空间分布趋于一致,则两者存在统计关联性。地理探测器q统计量,可用以度量空间分异性、探测解释因子、分析变量之间交互关系,已经在自然和社会科学多领域应用。
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地理探测器——地理所王劲峰 (387个子文件)
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