[R] (... not defined because of singularities) in lm()
Petr Pikal
petr.pikal at precheza.cz
Mon Aug 7 08:23:51 CEST 2006
Hi
On 4 Aug 2006 at 16:44, Jia Pu wrote:
To: r-help at stat.math.ethz.ch
From: Jia Pu <jpu at apple.com>
Date sent: Fri, 4 Aug 2006 16:44:44 -0700
Subject: [R] (... not defined because of singularities) in lm()
> I got the message, " Coefficients: (1 not defined because of
> singularities)", in the returned result of lm(). What does it mean?
> And where should I start investigating why it happens?
one of your variables (probably isInterNuclear:zeroSyllToEOP) is a
linear combination of other explanatory variables or is constant.
HTH
Petr
>
> thanks.
>
>
> /// Complete result of lm()
> Call:
> lm(formula = durationRatio ~ isHStar + isWordFinal + oneSyllToEOW +
> isInterNuclear + isIntonNuclear + isInterLP + isIntonLF +
> zeroSyllToNA + oneSyllToNA + zeroSyllToEOP + oneSyllToEOP +
> isInterNuclear:zeroSyllToEOP)
>
> Residuals:
> Min 1Q Median 3Q Max
> -3.031538 -0.126943 -0.002909 0.121606 4.322135
>
> Coefficients: (1 not defined because of singularities)
> Estimate Std. Error t value Pr(>|t|)
> (Intercept) 1.044481 0.010694 97.669 < 2e-16 ***
> isHStar -0.055227 0.005748 -9.607 < 2e-16 ***
> isWordFinal -0.262071 0.009982 -26.254 < 2e-16 ***
> oneSyllToEOW -0.031313 0.009917 -3.158 0.00160 **
> isInterNuclear 0.063470 0.015699 4.043 5.32e-05 ***
> isIntonNuclear 0.054570 0.011711 4.660 3.21e-06 ***
> isInterLP -0.262302 0.011868 -22.102 < 2e-16 ***
> isIntonLF -0.160018 0.012537 -12.764 < 2e-16 ***
> zeroSyllToNA -0.160767 0.011105 -14.477 < 2e-16 ***
> oneSyllToNA -0.012633 0.010779 -1.172 0.24123
> zeroSyllToEOP -0.212474 0.011987 -17.726 < 2e-16 ***
> oneSyllToEOP -0.123324 0.010998 -11.214 < 2e-16 ***
> isInterNuclear:zeroSyllToEOP NA NA NA NA ---
> Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
>
> Residual standard error: 0.2662 on 9650 degrees of freedom
> Multiple R-Squared: 0.3957, Adjusted R-squared: 0.395
> F-statistic: 574.5 on 11 and 9650 DF, p-value: < 2.2e-16
>
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Petr Pikal
petr.pikal at precheza.cz
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