On 9/11/22 07:17, Ebert,Timothy Aaron wrote:> It is a bad graphic as the legend that should explain the color coding is
missing. The next option is to copy the data and code and see if you can
reproduce the figure. You can then play with the code and read a bit about the
procedures to figure out what is going on. It should not be too hard. My guess
is that there is some additional variable with three states that is being used.
If this were the iris data set I would guess it was the three species: setosa,
versicolor, and virginica.
Pretty sure that guess is incorrect.
I'm not sure there should be a legend. The colors just indicate group
membership derived from a mathematical process that has attempted to
separate case into distinct groups that maximize the correlations within
individual groupings. And therefore maximizes the distance separating
the groups. The number of groups is specified in the function call. You
should go to the earlier results and see if you can construct the
groupings to maximize internal correlations. Psychometricians do this
when they don't really have a theoretical basis for doing classification
and are asking the data do it for them. If they are doing this on a
questionnaire dataset, they often go back to the specific
questions/answer pairings within groupings and try to assign meaning to
them.? They then build post-hoc explanations and often do further
studies to see if they can replicate the results and achieve some sort
of stable synthetic construct.? It's a rather theory-free strategy and
so trying to assign labels automatically would be difficult.
--
David
> Tim
>
> -----Original Message-----
> From: R-help <r-help-bounces at r-project.org> On Behalf Of Luigi
Marongiu
> Sent: Sunday, September 11, 2022 3:02 AM
> To: David Winsemius <dwinsemius at comcast.net>
> Cc: r-help <r-help at r-project.org>
> Subject: Re: [R] Interpreting fa.diagram from package psych
>
> [External Email]
>
> Sorry, the file was automatically downloaded and opened with the browser
instead of pointing to the webpage.
> Here is a better link:
>
https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcran.r-project.org%2Fweb%2Fpackages%2FpsychTools%2Fvignettes%2Ffactor.pdf&data=05%7C01%7Ctebert%40ufl.edu%7C9d0e49ff1aab4d5db2d308da93c3ac01%7C0d4da0f84a314d76ace60a62331e1b84%7C0%7C0%7C637984765998607455%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=2OxukCvxcx9xFJQiAInt2ulqC23qiBjQRPU128O%2Bjn8%3D&reserved=0
> The figure is on page 22.
> The question is: The dots have different colors; how do I know what they
represent?
> Is there a way to show an auto-legend?
> Thank you
>
> On Sat, Sep 10, 2022 at 11:33 PM David Winsemius <dwinsemius at
comcast.net> wrote:
>>
>> On 9/10/22 14:08, Luigi Marongiu wrote:
>>> Hello,
>>> I have plotted data from exploratory factor analysis, and I got a
>>> graph similar to FIGURE 11 (PAGE 36) of this link
>>> file:///home/gigiux/Downloads/An_overview_of_the_psych_package.pdf
>> This appears to be a link you a file on your personal device rather
>> than an attachment.
>>> How do I interpret the figure? In particular, how do I know what
the
>>> colors represent?
>>> Thank you
>
> --
> Best regards,
> Luigi
>
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