Using Stata 8, I want to produce a single histogram for MULTIPLE x-point
Likert-scale variables Y1 Y2... Yn (n << 5 for clarity). That is, I'd like
to compare discrete distributions side by side with something like this
(hopefully not mangled example) for two variables Y1 and Y2 over a 3+ point
Likert scale...
|
| ______
| | | ______
p | | | | |
e | ______ | | | |
r | | | | | | |
c | | | | | | |
e | _____| Y2 | | | _____| Y2 |
n | | | | | |_____ | | |
t | | Y1 | | | Y1 | | | Y1 | |
| | | | | | Y2 | | | |
| | | | | | | | | |
-----+-------------+-----------+---------->>
1 2 3
My data is a conventional structure where respondents are indexed by rows
and outcome variables are in columns, such as:
_n Y1 Y2
----- ---- -----
1 1 2
2 2 1
3 1 3
. . .
Given such data, my sense is that the desired graph is technically two
histograms overlaid (like in <twoway>) on each other. But since <histogram>
is not a <twoway> plot such a histogram is not possible: currently
<histogram> can only plot one variable at a time (I think).
While I can imagine transforming my data through some complicated collapse
and append commands, and then using <twoway bar>, this is simply too much
work. Relatedly, I could use Excel and other such programs to produce the
plot easily with summarized data. But I really want to avoid dumping data to
another program, especially Excel.
Am I again missing something, or does <histogram> need some improvement?
Thanks in Advance - Michael Oakes
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