[R] Output design question

From: Michael Kubovy <kubovy_at_virginia.edu>
Date: Wed, 16 Jul 2008 11:51:18 -0400


Dear R-helpers,

I was curious why the output of summary (and many other functions in R) does not add a separator between the name of a factor and the label of a level (e.g., in the example below, 'group Trt'). If the user had lower case labels (e.g., 'trt'), the output would be particularly hard to read.

ctl <- c(4.17,5.58,5.18,6.11,4.50,4.61,5.17,4.53,5.33,5.14)
trt <- c(4.81,4.17,4.41,3.59,5.87,3.83,6.03,4.89,4.32,4.69)
group <- gl(2,10,20, labels=c("Ctl","Trt"))
weight <- c(ctl, trt)
summary(lm.D9 <- lm(weight ~ group))
gives
Call:
lm(formula = weight ~ group)

Residuals:

     Min 1Q Median 3Q Max
-1.0710 -0.4938 0.0685 0.2462 1.3690

Coefficients:

             Estimate Std. Error t value Pr(>|t|)
(Intercept)   5.0320     0.2202  22.850 9.55e-15 ***
groupTrt     -0.3710     0.3114  -1.191    0.249

---

Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

Residual standard error: 0.6964 on 18 degrees of freedom Multiple R-squared: 0.07308, Adjusted R-squared: 0.02158 F-statistic: 1.419 on 1 and 18 DF, p-value: 0.249 Why not"group Trt"?



Professor Michael Kubovy
University of Virginia
Department of Psychology
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WWW: http://www.people.virginia.edu/~mk9y/

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