Scatter, Histogram, Bar Graphs - Econometrics - Lecture Slides, Slides of Econometrics and Mathematical Economics

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1

Graphs in Stata

Introduction to Scatter, Histogram & Bar-Graphs

2

Objectives

The Objectives of this lecture are:Use of Graphs for Exploring dataIntroduction to Scatter PlotIntroduction to HistogramIntroduction to Bar GraphIntroduction to Multiple Bar Graph

4

Graphs for ExplorationLoad

data ‘income

with labels’.The Graphs inStata

are

available

in

GraphicsMenu.Go to GraphicsMenu

Æ^

Select Easy graphs.

5

Graphs for Exploration

Easy graphs gives a few options and is mostsuited for the beginners.But^

the^

main

graph

menu

is^

for^

the

professional users.My suggestion is that you start with easygraphs and then Go to main graph menu.

7

Scatter Plot

The following Scatter Plot is plotted.From the graph, we can say that there is apositive

correlation

b/w

education

income.

8

Line Plot

Go to Graphics Menu

Æ^

Select Easy graph

Æ^

Select

Line graph. A new dialoguebox appears:Select ‘edu’ as Xvariable and‘income’ as Yvariable andclick OK.The graph shows

10

Histogram

Load data ‘roster.dta’ andselect Histogram from theGraphics Menu.A^

new

dialogue

box

appears.Select variable ‘province’and^

select

data

type

‘discrete data’.Click OK.

11

Histogram

The^

following

histogram

of^

the^

variable

‘province’ will appear.

13

Simple Bar GraphTo make the bar graph, Go to Graphics

Æ

Select Bar Chart.

14

Simple Bar GraphA^

dialogue

box

appears.

Select

variable

‘tempjan’ and in the statistics option, select‘mean’.Click OK.

16

Simple Bar GraphTo make the previousanalysis

more

clear,

we^

draw

the

bar

graph of temperaturein^ January

(temjan) over the regions.Click OK.The output is shown.Now graph isconveyinginformation betterth^

b f

17

Simple Bar GraphThe previous graph can still be made betterby changing the look of the graph.This can be done with the help of followingthree things:•Titles & Subtitle•Legends•Notes

19

Simple Bar GraphUnder the Caption tab, write note describingthe source of the data “Source: Dept. ofCommerce U.S”.

20

Simple Bar GraphAdd Legends as follows:Click OK.