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This module shows some of the options when using the twoway command to produce 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.
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Basic twoway scatterplot twoway (scatter read write)
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Schemes |
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Using Economist Scheme twoway (scatter read write) , scheme(economist) |
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Using s1mono Scheme twoway (scatter read write) , scheme(s1mono)
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Marker Placement Options (i.e. Jitter) |
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Scatterplot with jitter
twoway (scatter write read, jitter(3))
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Without jitter twoway (scatter write read)
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Marker Label Options |
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Using small black square symbols. twoway (scatter write read, msymbol(square) msize(small) mcolor(black))
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With markers red on the inside, black medium thick outline twoway (scatter write read, mfcolor(red) mlcolor(black) mlwidth(medthick) )
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Identifying Observations with Marker Labels twoway (scatter read write, mlabel(id))
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Using large red marker labels at 12 O'clock twoway (scatter read write if id <=10, mlabel(id) mlabposition(12) mlabsize(large) mlabcolor(red))
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Markers at 90 degree angle at 12 O'clock with a gap of 5 twoway (scatter read write if id <=10,
mlabel(ses) mlabangle(90) mlabposition(12) mlabgap(5))
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If mlabgap option is omitted twoway (scatter read write if id <=10, ///
mlabel(ses) mlabangle(90) mlabposition(12))
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Modifying marker position separately for variables (1) generate pos = 3 replace pos = 1 if (id == 5) replace pos = 5 if (id == 6) replace pos = 9 if (id == 3) twoway (scatter read write if id <= 10, mlabel(ses) mlabv(pos)) |
If option mlabv is not used twoway (scatter read write if id <= 10, mlabel(ses))
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Connect Options |
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Connecting with straight line egen mread = mean(read), by(write) twoway (scatter mread write, connect(l) sort) 
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If the sort option is omitted
twoway (scatter mread write, connect(l)) 
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Medium thick black dotted connecting line twoway (scatter mread write, connect(l) clwidth(medthick) clcolor(black) clpattern(dot) sort)
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Show gaps in line when there are missing values egen sdread = sd(read), by(write) twoway (scatter sdread write, connect(l) sort cmissing(n))
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Omitting cmissing option twoway (scatter sdread write, connect(l) sort cmissing(n))
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Footnotes
#1. Notice that the variable pos is used to control the position of the marker label. As shown in the code (repeated below), pos is assigned a value of 3 representing 3 O'Clock, and then when id is 5 the position of the marker label is 1 O'Clock, and when id is 5 the position is 5 O'Clock, and then when id is 3 the position is 9 O'Clock, allowing us to avoid labels that run off the edge of the graph or overwrite each other.
generate pos = 3
replace pos = 1 if (id == 5)
replace pos = 5 if (id == 6)
replace pos = 9 if (id == 3)
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