From jens.oehlschlaegel at truecluster.com  Sun Jun 18 12:34:11 2017
From: jens.oehlschlaegel at truecluster.com (=?UTF-8?Q?=22Jens_Oehlschl=C3=A4gel=22?=)
Date: Sun, 18 Jun 2017 12:34:11 +0200
Subject: [Rd] 'ordered' destroyed to 'factor'
In-Reply-To: <77AA9D07-5621-44CC-8A72-D41F98186AB6@gmail.com>
References: <trinity-35849798-65be-4033-aa6e-d006a5defe16-1497618225192@3capp-webde-bs21>
 <30D28A63376088428E8318DD67FD407F78BCE6@ny-mailstore1.walleyetrading.net>
 <77AA9D07-5621-44CC-8A72-D41F98186AB6@gmail.com>
Message-ID: <trinity-d2d5de82-e325-4875-a3c0-4f971f3cda64-1497782051901@3capp-webde-bap27>

Defending the status quo misses the point that R *could* handle ordinal data with a fixed set of levels but actually *does not*. Although it would be useful. Even if this does not imply to handle any possible straw-man situations. Having data-types for nominal, ordinal, and interval-scale data is - in theory - one of the major advantages of S over SAS. But *having* without *handling* means: only in theory, not in practice. Has r-devel really lost the momentum for continuous improvement, to converge R to an optimum? I struggle to recognize the project I loved in 2000.
?

Gesendet:?Freitag, 16. Juni 2017 um 18:31 Uhr
Von:?"peter dalgaard" <pdalgd at gmail.com>
An:?"Robert McGehee" <rmcgehee at walleyetrading.net>
Cc:?"Jens Oehlschl?gel" <jens.oehlschlaegel at truecluster.com>, "r-devel at r-project.org" <r-devel at r-project.org>
Betreff:?Re: [Rd] 'ordered' destroyed to 'factor'
> On 16 Jun 2017, at 15:59 , Robert McGehee <rmcgehee at walleyetrading.net> wrote:
>
> For instance, what would you expect to get from unlist() if each element of the list had different levels, or were both ordered, but in a different way, or if some elements of the list were factors and others were ordered factors?
>> unlist(list(ordered(c("a","b")), ordered(c("b","a"))))
> [1] ?

Those actually have the same levels in the same order: a < b

Possibly, this brings the point home more clearly

unlist(list(ordered(c("a","c")), ordered(c("b","d"))))

(Notice that alphabetical order is largely irrelevant, so all of these level orderings are equally possible:

a < c < b < d
a < b < c < d
a < b < d < c
b < a < c < d
b < a < d < c
b < d < a < c

).

-pd
--
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Office: A 4.23
Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com








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[Rd] 'ordered' destroyed to 'factor'
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