Scatter plots with multiple x and y variables ---------------------------------------------
^muxyplot^ yvars xvars [weight] [^if^ exp] [^in^ range] [ ^,^ graph_options ^l^ink ^n^eed^(^string^)^ ]
Description -----------
^muxyplot^ produces a scatter or twoway plot for yvars versus xvars, all of which xvars are measured on comparable scales. The number of yvars must equal the number of xvars. For example,
^muxyplot^ y1 y2 y3 x1 x2 x3
plots y1 versus x1, y2 versus x2 and y3 versus x3, all on the same scatter plot.
Options -------
graph_options are options allowed with ^graph, twoway^. ^connect^ and ^symbol^ refer to the y-axis variables. Note that
1. ^connect(||)^ and ^connect(II)^ are either unusable or irrelevant.
2. ^sy([_n])^ does not work properly. Instead do something like
^gen id = _n^ ^muxyplot^ ... ^, sy(...[id]...) need(id)^
3. As exemplified above, any variables named in options should also be specified in the ^need^ option.
^link^ connects each sequence of data points for each observation (x1, y1), (x2, y2), (x3, y3), ... by a segmented straight line. For example, if each pair of variables refers to a specific time, then the trajectory of an individual over time may be shown in this way. ^link^ may not be combined with ^connect()^.
^need(^string^)^ specifies variables needed by options and not mentioned before the options. (Otherwise, those variables would be lost by the ^stack^ included in ^muxyplot^.) Two or more variable names should be separated by spaces.
Limitation ----------
^by( ) link total^ is allowed as a combination of options but is not guaranteed to produce a correct ^total^ graph, because sorting first on the ^by( )^ variable may have the side-effect of producing spurious connections between data points.
Examples --------
. ^muxyplot wrunoff srunoff wrain17 srain17, c(ss) bands(7)^ . ^muxyplot br60 br70 br80 br90 dr60 dr70 dr80 dr90, link^
. ^regress y1 x1^ . ^predict y1p^ . ^regress y2 x2^ . ^predict y2p^ . ^muxyplot y1 y1p y2 y2p x1 x1 x2 x2, c(.l.l) sy(oipi) sort^ ^l2(y1 and y2) b2(x1 and x2)^
Author ------
Nicholas J. Cox, University of Durham, U.K. n.j.cox@@durham.ac.uk
Also see --------
On-line: help for @graph@, @muxplot@ (if installed) Manual: [R] graph