CODEWITHSUNDEEP
rmodelsummary
Xiphias
Xiphias

Reputation: 4716

Fully inspect an object in R

Question upfront: If use summary, I get a much more detailed view on my model than just print produces. In R, how can I know what extra information my object holds, such as revealed by summary, which I would not see without the knowledge of that generic function? Put in other words, how do I know what functions are available that yield additional information?

I conduct a quick linear least squares regression with:

model <- lm(seq(10) + runif(10) ~ seq(10))

Now, when I print the model, I get:

print(model)

Call:
lm(formula = seq(10) + runif(10) ~ seq(10))

Coefficients:
(Intercept)      seq(10)  
     0.3642       1.0413

Instead, when I use summary(model), I get a much more detailed view. Why wouldn't I obtain that in the first place?

> summary(model)

Call:
lm(formula = seq(10) + runif(10) ~ seq(10))

Residuals:
     Min       1Q   Median       3Q      Max 
-0.42297 -0.20032  0.00175  0.18183  0.39827 

Coefficients:
            Estimate Std. Error t value Pr(>|t|)    
(Intercept)  0.36419    0.18980   1.919   0.0913 .  
seq(10)      1.04133    0.03059  34.043 6.06e-10 ***
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

Residual standard error: 0.2778 on 8 degrees of freedom
Multiple R-squared:  0.9931,    Adjusted R-squared:  0.9923 
F-statistic:  1159 on 1 and 8 DF,  p-value: 6.057e-10

Upvotes: 2

Views: 4788

Answers (1)

IRTFM
IRTFM

Reputation: 263332

If you want a list of methods to use on a particular object try:

methods(class(object))

There was a relatively recent change to that function which now offers the S4 methods as well as the S3 ones it previously listed. It used to be that one needed to execute both that code as well as:

showMethods( classes=class(object) )

I will often use:

names(object)

... because the output of str(object) will be so extensive, but I really only want to check a few places and need the correct element name.

Upvotes: 4

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