CODEWITHSUNDEEP
arraysrstandardsdeviation
squishy
squishy

Reputation: 489

Standard deviation of each row between two columns in R

I have a simple query. I am trying to get the standard deviation of each row between two columns in an array (n=2 for the length of the array; I know it's a small sample size)

It forms part of a longer code but simply: 

data$i  <- sd(data$x, data$y)^2 + (0.1)^2 / data$j

so my data would look like this: 

x   y
3   13
4   9
19  3
14  3
18  4
3   10
9   4
3   6
3   8
10  9
8   10
11  9
13  12
15  14
19  16
8   8
8   18
11  14
10  12
18  14
12  20
6   8

and, just using the sd(), I would like to get this:

7.1
3.5
11.3
7.8
9.9
4.9
3.5
2.1
3.5
0.7
1.4
1.4
0.7
0.7
2.1
0.0
7.1
2.1
1.4
2.8
5.7
1.4

Upvotes: 1

Views: 5257

Answers (1)

MrFlick
MrFlick

Reputation: 206243

To apply sd() across the rows, you would use apply

apply(data[, c("x","y")],1,sd)

Upvotes: 4

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