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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: graphing the lines of the mean for a varaible by groups over time |

Date |
Fri, 12 Mar 2010 18:11:30 -0000 |

Nothing in your code instructs Stata to work with means. You are instructing Stata to plot all the values for all the panels. You should not be surprised that it does precisely that. There are various ways to proceed. One is to -collapse- to means and then plot the results. Nick n.j.cox@durham.ac.uk Mandy fu I have a question of graphing the lines of a variable by groups over time on a three-period panel data set. I have an unbalanced 3-period panel data set, where the observations are divided into four racial groups. I would like to plot the predicted value of Y (which is variable Y_hat, results from previous regression of Y on X variables) by racial groups over the three periods. The X-axis measures time, 1,2,3; The Y-axis measures Y-hat. In the graph there are four lines, repenting the four racial groups, which measure the mean Y_hat for a particular group at each time. The data set is as following: ------------------------------------------------------------ ID Y_hat time race Y X1 X2 1 1.22 1 1 1 2.03 2 1 1 3.00 3 1 2 1.45 1 2 2 2.67 2 2 2 missing 3 2 ------------------------------------------------------------ I tried the following syntax: ------------ line Y_hat time if race==1 ,c(L) /// || line Y_hat time if race==2 ,c(L) /// || line Y_hat time if race==3 ,c(L) /// || line Y_hat time if race==1 ,c(L) /// || , title("plotting") --------------- The graph from the above syntax includes lots of lines, which is not what I would like to see. I think I must misunderstood something here. I would appreciate if you could give me some suggestions. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st:graphing the lines of the mean for a varaible by groups over time***From:*Mandy fu <mandy.fu1@gmail.com>

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