Does this mean my dataset has too few observations?

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TingTing
TingTing 2014-7-17
评论： Star Strider 2014-7-17
I ran a GLM regression with 5 indepedent variables. My dataset contains 238 observations and I got error message like this:
Warning: Regression design matrix is rank deficient to within machine precision. > In TermsRegression>TermsRegression.checkDesignRank at 98 In GeneralizedLinearModel>GeneralizedLinearModel.fit at 1174 In fitglm at 133
Does this mean I have too few observations? Because if I have 347 observations, it runs fine without any complaints.

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回答（1 个）

Star Strider
Star Strider 2014-7-17
My guess is that there is something strange about Observation #238. Check it to see that all the data in it are valid.
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TingTing
TingTing 2014-7-17
Hi, thanks a lot for reply! I wonder why you mentioned Observation #238. I plotted out leverage and ¤238 does not seem to be outlier. While #20 seems to be outlier. I excluded #20 and still got the same error message...
Star Strider
Star Strider 2014-7-17
My point is that there is something about the added observation that is crashing your design matrix. I would check to see that all the data in that observation are valid.

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