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From |
dwagner@stata.com (Derek Wagner, Stata Corp) |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Re: graphing and shading |

Date |
Fri, 06 Jun 2003 12:18:24 -0500 |

> Hi everyone, > > I've got a quation regarding the new graphing facilities in STATA8. > > Lets say I've got some GDP data over time. Stata provides a means whereby I can > demarcate a year using xline. Thus, I could show the great depression as the > area between two vertical lines: > - twoway connected gdp time, xline(1929 1945) > > But lets say that I'd like to shade the area between two years (useful if I > want to have a bunch of intervals indicating time of recession. Is there a way > to do this in STATA? > > Thanks. > > --John > > John, > A similar question came up last month. Gerald Wright (wright1@indiana.edu) > came up with this example to show how it may be done: > preserve > sysuse gnp96,clear > sum gnp > local max=`r(max)' > gen c=`max' if date>q(1992q1)&date<q(2001q1) > lab var c "Clinton Years" > twoway (area c date, bcolor(gs15)) (line gnp date, clpattern(solid)) > restore > Hope this helps, > Scott Another way (and somewhat easier way) to produce the same graph as the above is to use the -scatteri- command with the -recast- option. The -scatteri- command allows you to plot points manually in the graph region, and the -recast- option allows you to recast the points into an area plot. By finding the maximum value for the y-axis, you could plot one point at the beginning of the date range in need and one at the end. Recasting to an -area- plot will automatically include the area beneath the plotted points. For example, using the same data as above: sysuse gnp96,clear twoway (scatteri 10000 `=q(1992q1)' 10000 `=q(2001q1)', bcolor(gs15) recast(area) /// legend(on order(1 "Clinton Years" 2 "Real GNP"))) /// (line gnp date, clpattern(solid)), xlabel(, format(%tq)) As you can see, you can also avoid creating macros by using Stata's in-line evaluation feature. The expressions `=q(1992q1)' and `=q(2001q1)' get evaluated to 128 and 164, respectively. So, I've told Stata to plot points at (128,10000) and (164,10000). Then, the -recast(area)- option shaded the region below the two points with a bar color of gs15. The only thing left to do after overlaying the -line- graph is to reformat the time series labels for the x-axis using the -xlabel- option. Hope this helps. Derek Wagner (dwagner@stata.com) * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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