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Re: st: Cluster analysis variables - bug?
--
The name option names group variable. In Stata 9.2, only one group
variable is created at a time. Did you run a previous cluster
analysis on the same data, possibly different variables, with three
groups and "name(cluster)"? If so, that would account for your
finding.
--Steve
Example:
. sysuse auto
(1978 Automobile Data)
. cluster kmeans mpg weight displacement, k(3) name(cluster01)
. cluster list cluster01
cluster01 (type: partition, method: kmeans, dissimilarity: L2)
vars: cluster01 (group variable)
other: k: 3
start: krandom
range: 0 .
cmd: cluster kmeans mpg weight displacement, k(3) name
(cluster01)
varlist: mpg weight displacement
. tab cluster01
cluster01 | Freq. Percent Cum.
------------+-----------------------------------
1 | 15 20.27 20.27
2 | 39 52.70 72.97
3 | 20 27.03 100.00
------------+-----------------------------------
Total | 74 100.00
. ds
make mpg headroom weight turn
gear_ratio cluster01
price rep78 trunk length displacement
foreign
On Aug 8, 2007, at 12:56 PM, Ricardo Ovaldia wrote:
Thank you Nick. But I am not sure that helps. Both
variables are discrete taking the values 1, 2 and 3.
(I specific 3 clusters). Every value of -C1- appears
for every value of -cluster-. I am at lost.
| c1
cluster | 1 2 3 |
Total
-----------+---------------------------------+----------
1 | 71 90 17 |
178
2 | 4 200 596 |
800
3 | 123 164 5 |
292
-----------+---------------------------------+----------
Total | 198 454 618 |
1,270
--- Nick Cox <[email protected]> wrote:
A scatter plot of the two variables may
throw light on this.
Nick
[email protected]
Ricardo Ovaldia
This may be a very simple question, but I can't
find
the answer. Doing a cluster analysis I typed:
. cluster kmeans q4_*, k(3) name(c1)
s(kr(67492))
I get two new variables -c1- and -cluster-.
These
are
different. Could someone please tell me what is
the
difference between these two variables? Which
one
is
the cluster indicator.
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Ricardo Ovaldia, MS
Statistician
Oklahoma City, OK
______________________________________________________________________
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Ricardo Ovaldia, MS
Statistician
Oklahoma City, OK
______________________________________________________________________
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Steven Joel Hirsch Samuels
[email protected]
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Saugerties, NY 12477
Phone: 845-246-0774
EFax: 208-498-7441
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