Dear Kim
See inline
On 19/03/2019 22:29, Kim Jacobsen wrote:
Mailing list now included (apologies, first time I post anything so not
quite sure how it works).
You are quite right, it was a typo. I meant to write that
plot.xmean.ordinaly(). So please let me correct my last statement: the
plot.xmean.ordinaly() command and plot() command are interchangeable as
long as x is an object x of class "xmean.ordinaly", and
plot.xmean.ordinaly() is best used if the object is not of class
"xmean.ordinaly" or if you are unsure what class it it. Is this a correct
encapsulation?
I think the best way to think about it is that plot() looks at whatever
you gave it to plot and then looks at all the plot methods it knows
about to see if it has one which matches the class of whatever you gave
it. It then uses that one. In general unless you know you need to
override that behaviour you should never need to explicitly use any of
the other plot methods. The same applies to all the other methods like
print() summary() and so on.
Michael
On Sun, 17 Mar 2019 at 14:38, Jeff Newmiller <jdnew...@dcn.davis.ca.us>
wrote:
Please keep the mailing list included in the thread.
I can't tell if you do understand and are just being sloppy, or if you are
completely confused, because xmean.ordinaly() and plot.xmean.ordinaly() are
two completely different symbols in R.
As for being "safe"... you may choose to be specific or not, but plot and
plot.xmean.ordinaly are both equally "safe" to call, and being too specific
can cause problems sometimes as well.
On March 17, 2019 6:40:10 AM PDT, Kim Jacobsen <kimsjacob...@gmail.com>
wrote:
Dear Jeff,
Thank you so much! So if I understand the S3 object documents
correctly,
the xmean.ordinaly() command and plot() command are interchangeable as
long
as x is an object x of class "xmean.ordinaly"? So would I be right to
think
that I might as well just xmean.ordinaly() to be safe?
Many thanks,
On Sun, 17 Mar 2019 at 02:08, Jeff Newmiller <jdnew...@dcn.davis.ca.us>
wrote:
Read up on S3 object orientation[1]. If you have an object x of class
"xmean.ordinaly" then writing
plot(x)
will end up invoking the plot.xmean.ordinaly function rather than the
plot.default function in base graphics. This is broadly true
throughout R.
[1] http://adv-r.had.co.nz/S3.html
On March 16, 2019 11:03:06 AM PDT, Kim Jacobsen
<kimsjacob...@gmail.com>
wrote:
Would anyone be able to explain what the difference is between
plot.xmean.ordinaly and plot() in the "rms" package? (for the
purposes
of
testing the proportional odds assumption in ordinal models). In the
package
document (https://cran.r-project.org/web/packages/rms/rms.pdf) they
seem
both to be used interchangeably.
Thank you!
--
Sent from my phone. Please excuse my brevity.
--
Sent from my phone. Please excuse my brevity.
--
Michael
http://www.dewey.myzen.co.uk/home.html
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