Choropleth maps are a means of visualizing spatial data by shading or patterning areas of a map in proportion to the values of a variable. This kind of map can provide insight into how a variable is distributed across a geographic area or the level of variability within a region.
Is your data not in the format of your favorite statistical package? Multiple files need to be merged and reformatted? You've been doing these tedious tasks by hand? There is a better way! Read about an example using a time series of Indian rainfall data.
The selection of a sampling method and sample size is a critical step in the applied research process. The choice depends on factors such as the focus and characteristics of the study, the research population and the effect sizes of interest.