stata in space stata data analysis and statistical softwarestata在空间 stata数据分析及统计软件.ppt

Stata in Space:;Outline;Introduction;Spatial data analysis;What’s special about spatial data ? = Location matters !!! = Tobler’s 1st law of geography (1979): “Everything is related to everything else, but near things are more related than distant things.” = Spatial effects: - spatial autocorrelation - spatial heterogeneity ;Spatial data analysis;Spatial data analysis;Spatial data analysis;Spatial data analysis;Spatial data analysis;Spatial data analysis;Spatial data analysis;Data preparation;Data preparation;Data preparation;Data preparation;The empirical example;Data Satellite image interpretation: - land cover = land use (change) GIS, maps, point measurements: - geophysical indicators = topography, soil, climate Socioeconomic policy variables: - village survey, secondary statistics = technology, population, education, market access Data integration based on spatial identifier and (approximated) village areas;Observations: 964,000 pixels (50 x 50 m) Spatial sample: every 5. cell in X Y direction Estimation: 35,000 observations = Dependent: five land cover classes (1, 2, .., 5) = Independent: a) geophysical b) socioeconomic c) policy d) spatial effects;Econometric estimation;Outputting results from Stata dta2ras [varlist], xcoord(#) ycoord(#) cellsize(#) [ header(filename) idcell(varname) nodata(#) xllcorner(#) yllcorner(#) saving(varlist) replace ] writes header in front of file with the information from xcoord(#) ycoord(#) cellsize(#) or header(); (optionally) nodata(#) xllcorner(#) yllcorner(#) then the results can be mapped in the GIS;Geovisualization of results;Geovisualization of results;Thank you !Questions, comments and critique welcome !  ____________________________? Daniel Müller (danielix@gmx.net)Institute of Agricultural Economics and Social Sciences---- Humboldt University Berlin ----Stata ados available for download at: ://amor s.hu-berlin.de/~muelleda