Using Stata to Create Interactive Maps

Using Stata to

Create Interactive

Maps

Ali Lauer and

Austin Nichols

July 27, 2017

Stata Conference

Contents

¡ì Standard maps in Stata

¨C twoway command

¨C shp2dta command

¨C Geographic analysis

¡ì Interactive Maps

¨C file command

¨C Javascript and JSON objects for the web

Abt Associates | pg 2

twoway

¡ì Maps can be constructed in Stata using twoway commands

¨C Built-in command

¨C Available in secure environments

¡ì Use polygon ¡°shape file¡± dataset

¨C twoway area

¨C Options: nodropbase cmiss(no) yscale(off) xscale(off)

¡ì

Separated by || or set off by (), as in any graph

Map Types:

¡ì

Choropleth: use multiple calls to area each with if qualifiers to build a

choropleth

¡ì

Point Data: use scatter to superimpose point data

Abt Associates | pg 3

shp2dta

¡ì shp2dta command converts various shapefile

formats into Stata data

¨C User-written command by Kevin Crow, freely available

through SSC Archive

¨C Shape file (coordinates file) contains _X (longitude), _Y

(latitude), and _ID (shape identifier) variables

¨C Data file has info on each shape

? .shp

? .dbf

shp2dta ¨¤

2 Stata datasets:

? Shape file

? Data file

Abt Associates | pg 4

Example ¨C Mapping Census Tracts

¡ì Map of Census tracts in Delaware,

with one county highlighted

¡ì Download the shape file from

Census Bureau

¨C Publically available data

¡ì Convert to a Stata dataset using

shp2dta command

¡ì Map using twoway command

Abt Associates | pg 5

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