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From |
David Airey <david.airey@vanderbilt.edu> |

To |
statalist@hsphsun2.harvard.edu |

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

Date |
Sat, 17 Apr 2004 11:58:30 -0500 |

Maybe "spaghplot" from ATS UCLA might be of interest too:

------------------------------------------------------------------------ -------

help for spagplot

------------------------------------------------------------------------ -------

Spaghetti Plot

spagplot yvar xvar [if exp] [in range], id(idvar) [nofit] [graph

options]

where yvar xvar are the Y and X variables you wish to plot and idvar is

the variable that identifies a single observation. Description

spagplot allows you to "spaghetti plot", i.e. a plot of an X variable and

the predicted values for the Y variable forming a regression line of the

predicted values of Y by X. A separate regression line is plotted for

each observation indicated by the idvar variable.

If you specify the nofit option, the actual y values (not the fitted y values

will be plotted.

Examples

We will show a number of examples from a data file which contains alcohol

use alcuse at 3 ages, age 14, 15, and 16 for a number of children

(identified by the variable id. The age variable has been centered

around age 14 and is named {id:age_14}. We first show how to obtain the

data file.

. use http://www.ats.ucla.edu/stat/stata/examples/alda/data/alcohol1_pp

This example shows a basic spaghetti plot of alcohol use by age, broken

down by id.

. spagplot alcuse age_14 , id( id )

This example just performs the plot for the first 30 observations.

. spagplot alcuse age_14 in 1/30, id( id )

This example shows the plot just for the ids below 9.

. spagplot alcuse age_14 if id <= 9, id( id )

This example adds a title as a graph option.

. spagplot alcuse age_14 , id( id ) ytitle("Predicted Alcohol Use")

This example adds a title as a graph option, and changes the scheme to

sj.

. spagplot alcuse age_14 , id( id ) ytitle("Predicted Alcohol Use") scheme(sj)

This example also changes the note from the default note.

. spagplot alcuse age_14 , id( id ) ytitle("Predicted Alcohol Use") scheme(sj)

> note("My custom note")

This example removes the note from the graph entirely.

. spagplot alcuse age_14 , id( id ) ytitle("Predicted Alcohol Use") scheme(sj)

> note("")

If you have comments or suggestions, please email Michael Mitchell at

mnm@@ucla.edu .

Author

Michael N. Mitchell

Statistical Computing Group

UCLA, Academic Technology Services

mnm@@ucla.edu

Also see

Manual: [R] graph

Online: help for graph

*

* 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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