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This module shows examples of combining twoway scatterplots. This is illustrated by showing the command and the resulting graph. This includes hotlinks to the Stata Graphics Manual available over the web and from within Stata by typing help graph.
This illustrates combining graphs in the following situations.
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Plots for separate groups |
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Separate graphs by gender (male and female) twoway (scatter read write), by(female)
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Separate graphs by ses and gender twoway (scatter read write), by(female ses) |
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Swapping position of ses and gender twoway (scatter read write), by(ses female, cols(2))
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Combining scatterplots and linear fit in one graph |
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Scatterplot with linear fit twoway (scatter read write) ///
(lfit read write) , ///
ytitle(Reading Score)
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Graphs separated by SES and female with linear fit lines and points identified by id twoway (scatter read write, mlabel(id)) ///
(lfit read write, range(30 70)) , ///
ytitle(Reading Score) by(ses female)
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Graph for high ses females with linear fit with and without obs 51 twoway (scatter read write, mlabel(id)) ///
(lfit read write, range(30 70)) ///
(lfit read write if id != 51, range(30 70)) if female==1 & ses==3, ///
ytitle(Reading Score)
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Combining scatterplots with multiple variables and linear fits |
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Reading and math score by writing score twoway (scatter read write) ///
(scatter math write)
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Reading and math score by writing score with fit lines twoway (scatter read write) ///
(scatter math write) ///
(lfit read write) ///
(lfit math write)
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Adding legend to above graph twoway (scatter read write) ///
(scatter math write) ///
(lfit read write) ///
(lfit math write), ///
legend(label(3 "Linear Fit") label(4 "Linear Fit")) ///
legend(order(1 3 2 4))
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Final version of graph twoway (scatter read write) ///
(scatter math write) ///
(lfit read write, pstyle(p1) range(25 80) ) ///
(lfit math write, pstyle(p2) range(25 80) ), ///
legend(label(3 "Linear Fit") label(4 "Linear Fit")) ///
legend(order(1 3 2 4))
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Combining scatterplots and linear fit for separate groups |
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Overlay graph of males
and females in one graph
separate write, by(female) twoway (scatter write0 read) (scatter write1 read), /// ytitle(Writing Score) legend(order(1 "Males" 2 "Females"))
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Overlay graph of males
and females in one graph with linear fit lines
twoway (scatter write0 read) (scatter write1 read) ///
(lfit write0 read) (lfit write1 read), ///
ytitle(Writing Score) ///
legend(order(1 "Males" 2 "Females" 3 "Lfit Males" 4 "Lfit Females"))
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Combining separate graphs into one graph |
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Making the Graphs First, we make 3 graphs (not shown) twoway (scatter read write) (lfit read write), name(scatter) regress read write rvfplot, name(rvf) lvr2plot, name(lvr) Now we can use graph combine to combine these into one graph, shown below. graph combine scatter rvf lvr
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Combining the graphs differently We can move the place where the empty graph is located, as shown below. graph combine scatter rvf lvr, hole(2)
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