[R] Nested model - "singularities not defined"

[Bert Gunter]

... and  John Nash's comment (regarding another issue) may also be appropriate:

"...  As with many tools in this domain, for effective use they
require more knowledge than many of their users possess, and can be
dangerous because they
seem to "work". "


-- Bert

On Sat, Dec 24, 2011 at 9:44 AM, David Winsemius <dwinsemius at comcast.net> wrote:
>
> On Dec 24, 2011, at 12:07 PM, Kristen Mancuso wrote:
>
>> I am using a nested model in R and the lm output shows 47 not defined
>> because of singularities and I have no idea why.  Any help on why this is
>> happening or how to fix this problem would be very much appreciated.
>>  Below
>> is the output I received from R.
>
>
>> not defined because of singularities
>
>
> This question should be a FAQ if it's not already:
>
> http://lmgtfy.com/?q=%22not+defined+because+of+singularities%22
>
>
>
> --
>
> David Winsemius, MD
> West Hartford, CT
>
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> and provide commented, minimal, self-contained, reproducible code.



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

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