Date:         Thu, 18 Feb 2010 16:31:42 +1030
Reply-To:     Kylie Lange <kylie.lange@adelaide.edu.au>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Kylie Lange <kylie.lange@adelaide.edu.au>
Subject:      scatterplot with double legend
Content-Type: text/plain; charset=ISO-8859-1

Hi all,

I wish to draw a scatterplot with markers defined by two categorical variables -
one for the colour and the second for the shape.

I have data such as the following:
data list free / group item x y.
begin data.
1 1 856 385
1 2 1142 824
1 3 1064 497
1 4 1036 543
1 5 547 796
1 6 576 507
1 7 1050 488
2 1 1688 673
2 2 1093 367
2 3 1050 545
2 4 1043 740
2 5 775 293
2 6 1621 495
2 7 869 403
3 1 1008 488
3 2 570 338
3 3 656 756
3 4 1485 794
3 5 1394 322
3 6 1345 540
3 7 1159 619
end data.

I'm trying to generate a scatterplot of x vs y, with colours set according to
the 'group' variable, and the marker shape set according to the 'items'
variable. I don't know if it needs the 'group' and 'item' variables as I've got
them, or a new variable for the combination (ie, values 1-21)? I don't really
know enough about GPL to know where to start with this one.

Any suggestions would be appreciated.

Thanks,
Kylie.

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