By Stephen P. Kaluzny, Silvia C. Vega, Tamre P. Cardoso, Alice A. Shelly
S+SPATIALSTATS is the 1st complete, object-oriented package deal for the research of spatial facts. delivering a complete new set of study instruments, S+SPATIALSTATS used to be created in particular for the exploration and modeling of spatially correlated info. it may be used to investigate facts coming up in components equivalent to environmental, mining, and petroleum engineering, common assets, geography, epidemiology, demography, and others the place facts is sampled spatially. This clients handbook presents the documentation for the S+SPATIALSTATS module.
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Extra info for S+SpatialStats: User’s Manual for Windows® and UNIX®
Example text
98 :14 6340 Mean : 131. 91 3rd Qu. 2 3rd Qu. 41 : 14 6300 6260 :12 Max. 0 Max. 92 (Other):51 long tcatch prerec Min. 70 Min. Min. 00 1st Qu. 50 3rd Qu. 31 3rd Qu. 2 3rd Qu. 52 Max. Max. 0 Max. 00 40 3. Visualizing Spatial Data recruits Min. 75 Max. ) An initial look at summary statistics suggests highly skewed data, since the mean and median are far apart. Perform a log transformation on the tcatch values to approximate normality: > scallops [, 11gcatch"J <- log(scallops$tcatch+1) > summary(scallops$lgcatch) Min.
5. Locations for Wolfcamp, showing four groupings of data. groups) The plot argument type="n" plots a blank page with the correct axis scaling-this is a necessary preparation for using text which will then add textual labels corresponding to each point. 5 shows an apparent spatial trend, with the highest values (group 4) in the lower left corner of the plot. 6. aq) detach (" aquif er") The par (pty=" s") command creates a square plotting region, which is often desirable for displaying location data.
4). 5). 1. EDA Tools 19 examples in subsequent sections. 3). 1 Descriptive Statistics Descriptive statistics allow a first look at the characteristics of your data. They include simple ways to look for outliers and departures from normality. 20 Min. 90 Max. 80 northing Min. 360 3rd Qu. 800 Max. head Min. : 1548 Median : 1797 Mean :2002 3rd Qu. : 2540 Max. : 3571 The aquifer data set contains piezometric head heights (in feet above sea level) for the Wolfcamp Aquifer in West Texas [(Cressie, 1989, p.