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From |
"Scott Merryman" <[email protected]> |

To |
<[email protected]> |

Subject |
st: Re: simple (?) graph question |

Date |
Fri, 16 Apr 2004 21:08:45 -0500 |

Twoways come to mind. The first is to -reshape- the data into a long format and then use -xtline-. The second is to -xpose- the data and use -twoway connect- Examples below: Example 1. . l +---------------------------+ | patient value1 value2 | |---------------------------| 1. | 1 51 48 | 2. | 2 49 53 | 3. | 3 47 59 | +---------------------------+ . reshape long value, i(patient) j(time) (note: j = 1 2) Data wide -> long ---------------------------------------------------------------------------- - Number of obs. 3 -> 6 Number of variables 3 -> 3 j variable (2 values) -> time xij variables: value1 value2 -> value ---------------------------------------------------------------------------- - . tsset patient time panel variable: patient, 1 to 3 time variable: time, 1 to 2 . xtline value, overlay plopts1(recast(connected)) plopts2(recast(connected)) plopts3(recast(connected)) xlabel( 1 2) Or, an alternative way to get the dots at each point . xtline value, overlay xlabel( 1 2) plot(scatter value time) legend(order(1 2 3)) Example 2 . l +--------------------+ | var1 var2 var3 | |--------------------| 1. | 1 51 48 | 2. | 2 49 53 | 3. | 3 47 59 | +--------------------+ *Make sure the data are saved! . xpose, clear . drop in 1 (1 observation deleted) . gen time = _n . forv i = 1/3 { 2. label var v`i' "Patient `i'" 3. } . twoway (connect v1 time) (connect v2 time) ( connect v3 time) , xlabel(1 2) Hope this helps, Scott ----- Original Message ----- From: <[email protected]> To: <[email protected]> Sent: Friday, April 16, 2004 5:19 PM Subject: st: simple (?) graph question > All, > > I have a simple graph question. I paged through the Graphics manual and > looked at the pull down menu but can't figure out an answer. > > I have a small data set of before and after lab values on 20 individuals. > I would like to do a dot graph with two values on the x-axis, "before" and > "after", and the lab value on the y axis. I would like to connect the > before and after dots for each individual with a line, so I would have 20 > lines. > > The data are arranged: > > Patient # Value 1 Value 2 > 1 51 48 > 2 49 53 > 3 47 59 > . > . > . > and so on... > > Thanks, and have a good weekend, > Jim Seward * * 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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