[R] plot.xmean.ordinaly vs plot() in package "rms"

[Jeff Newmiller]

No. Do not call plot.xmean.ordinaly() if the argument is not of class xmean.ordinaly, because that function assumes that it is such an object.

That is one reason why it is better to call plot() than to be more specific.

On March 19, 2019 3:29:11 PM PDT, Kim Jacobsen <kimsjacobsen using gmail.com> 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?
>
>
>On Sun, 17 Mar 2019 at 14:38, Jeff Newmiller <jdnewmil using 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
><kimsjacobsen using 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
><jdnewmil using 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
>> ><kimsjacobsen using 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.
>>

-- 
Sent from my phone. Please excuse my brevity.