[Rd] 'ordered' destroyed to 'factor'

peter dalgaard pdalgd at gmail.com
Fri Jun 16 18:31:47 CEST 2017

> 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


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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