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Nested model - "singularities not defined"
3 messages · Kristen Mancuso, David Winsemius, Bert Gunter
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
... 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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Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm