The difference of na rm and na omit in R

0 votes

I've just started with R and I've executed these statements:

library(datasets)
head(airquality)
s <- split(airquality,airquality$Month)
sapply(s, function(x) {colMeans(x[,c("Ozone", "Solar.R", "Wind")], na.rm = TRUE)})
lapply(s, function(x) {colMeans(na.omit(x[,c("Ozone", "Solar.R", "Wind")])) }) 

For the sapply, it returns the following:

             5         6          7          8         9
Ozone    23.61538  29.44444  59.115385  59.961538  31.44828
Solar.R 181.29630 190.16667 216.483871 171.857143 167.43333
Wind     11.62258  10.26667   8.941935   8.793548  10.18000

And for lapply, it returns the following:

$`5`
    Ozone   Solar.R      Wind 
 24.12500 182.04167  11.50417 

$`6`
    Ozone   Solar.R      Wind 
 29.44444 184.22222  12.17778 

$`7`
     Ozone    Solar.R       Wind 
 59.115385 216.423077   8.523077 

$`8`
    Ozone   Solar.R      Wind 
 60.00000 173.08696   8.86087 

$`9`
    Ozone   Solar.R      Wind 
 31.44828 168.20690  10.07586 

Now, my question would be, why are the returned values similar, but not the same? Isn't na.rm = TRUE and na.omit supposed to be doing the exact same thing? Omit the missing values and calculate the mean only for the values that we have? And in that case, shouldn't I have had the same values in both result sets?

Jul 22 in Data Science by avinash
• 1,840 points
17 views

No answer to this question. Be the first to respond.

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.

Related Questions In Data Science

0 votes
1 answer

Difference between the == and %in% operators in R

percent in percent "returns a vector of ...READ MORE

answered Jun 20 in Data Science by Sohail
• 2,960 points
21 views
0 votes
1 answer

Difference between the == and %in% operators in R

According to help('percent in percent'), percent in ...READ MORE

answered Jun 23 in Data Science by Sohail
• 2,960 points
15 views
0 votes
1 answer

The difference between Map() and map () from Purrr package in R

The tilde just indicates to the map ...READ MORE

answered Jun 14 in Data Science by Sohail
• 2,960 points
30 views
0 votes
1 answer

What's the difference between "*" and "+" in lm() in R?

Lm is a fitting method for linear ...READ MORE

answered Jun 24 in Data Science by Sohail
• 2,960 points
24 views
0 votes
0 answers

How to manually find the minors of a matrix in R programming?

I have to write a function that ...READ MORE

Jul 5 in Data Science by avinash
• 1,840 points
8 views
0 votes
0 answers

What is the difference between rm() and rm(list=ls())?

The majority of items I've read. They ...READ MORE

Jul 5 in Data Science by avinash
• 1,840 points
12 views
0 votes
1 answer

Big Data transformations with R

Dear Koushik, Hope you are doing great. You can ...READ MORE

answered Dec 18, 2017 in Data Analytics by Sudhir
• 1,610 points
438 views
0 votes
2 answers

Transforming a key/value string into distinct rows in R

We would start off by loading the ...READ MORE

answered Mar 26, 2018 in Data Analytics by Bharani
• 4,660 points
482 views
0 votes
1 answer

Finding frequency of observations in R

You can use the "dplyr" package to ...READ MORE

answered Mar 26, 2018 in Data Analytics by Bharani
• 4,660 points
4,353 views
0 votes
1 answer

Left Join and Right Join using "dplyr"

The below is the code to perform ...READ MORE

answered Mar 27, 2018 in Data Analytics by Bharani
• 4,660 points
504 views
webinar REGISTER FOR FREE WEBINAR X
Send OTP
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP