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2017 Aug 11
0
PROC MIXED RANDOM equivalence in R nlme
...ied of. ~ Sir Ronald Aylmer Fisher
The plural of anecdote is not data. ~ Roger Brinner
The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey
2017-08-10 15:34 GMT+02:00 Dennis F. Kahlbaum <kbomb at umich.edu>:
> I am trying to reproduce some old SAS PROC MIXED code using R and nlme.
> The data consists of emission readings from vehicles and fuel properties.
> All variables are real numbers except "study" and "vehicle", which are
> character. Unfortunatel...
2017 Aug 10
4
PROC MIXED RANDOM equivalence in R nlme
I am trying to reproduce some old SAS PROC MIXED code using R and nlme.
The data consists of emission readings from vehicles and fuel
properties. All variables are real numbers except "study" and "vehicle",
which are character. Unfortunately, since the data are confidential, I'm
unable to provide an example.
The original SAS v6.12 code is provided below:
2017 Aug 11
0
PROC MIXED RANDOM equivalence in R nlme
> On Aug 11, 2017, at 7:56 AM, Dennis F. Kahlbaum <kbomb at umich.edu> wrote:
>
> Hi Robert:
>
> Thanks for your response, as well.
>
> I'm sorry. As you've discovered, I made some capitalization errors when posting my R code. The actual R code does use "lme", "data", and "random".
>
>...
2017 Aug 11
2
PROC MIXED RANDOM equivalence in R nlme
Hi Robert:
Thanks for your response, as well.
I'm sorry. As you've discovered, I made some capitalization errors when
posting my R code. The actual R code does use "lme", "data", and "random".
The dataframe is indeed named "emiss" and each item in the formula is a
column in the dataframe. I used the following R code to read in the