CODEWITHSUNDEEP
r
Chris Elliott
Chris Elliott

Reputation: 31

R function parameters in quotes / not in quotes

In R, some functions expect the function parameters to be in quotes, like this:

summarySE(xx, measurevar= "X1F1", groupvars="genotype",na.rm=TRUE)

others seem happy with the same parameter without ", like this:

aov(data=xx,X1F1~genotype)

How can I convert from a string like "X1F1" to the X1F1 required by the formula Here's my data

    genotype      X1F1       X2F1
 1         R  43.33877   7.881666
 2         R 130.34433  65.056984
 3         R  53.39783  11.985018
 4         R  23.45456   5.683387
 5         R 138.50044  61.194956
 6         R 108.63964  39.581222
 7         R 153.60738  55.854238
 8         T 264.96127 108.751380
 9         T 222.94124 119.695112
10         T 119.55373  36.793537
11         T  34.97877  12.285921

Upvotes: 2

Views: 206

Answers (1)

Artem
Artem

Reputation: 3414

You can use data.frame column names in formula. Two lm below will give the same result:

df <- data.frame(x = 1:100, y = rnorm(100))
# Option 1. As formula
lm(y ~ x, df)

# Option 2. As data.frame index
lm(df[, "y"] ~ df[, "x"])

Upvotes: 1

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