Re: [R] Passing variable name

Rui Barradas Sun, 27 Dec 2020 14:58:56 -0800

Hello,

Or maybe V1 and V2 are variables that hold column names?

If so see thess StackOverflow posts [1], [2]. The trick is to use [[,not $ to extractthe columns.



V1 <- "Gender"
V2 <- "Hand"

MyT2 <- table(MyData[[V1]], MyData[[V2]])

[1]:https://stackoverflow.com/questions/18222286/dynamically-select-data-frame-columns-using-and-a-vector-of-column-names

[2]:https://stackoverflow.com/questions/1169456/the-difference-between-bracket-and-double-bracket-for-accessing-the-el



Hope this helps,

Rui Barradas


Às 21:48 de 27/12/20, Jim Lemon escreveu:

Sorry, Bert, I also forgot to copy to the list.

Hi Seyet Ali,
If you have created the data frame, you probably know that "Gender",
"Hand" and "Gr" are the names of the vectors of values that are joined
in the data frame "MyData". You now wish to change those names. I
don't know why you would change the names to obscure ones like "V1",
but I suggest a look at the "names" function. The answer to your
question should now be clear to you.

Jim

On Mon, Dec 28, 2020 at 8:47 AM Jim Lemon <drjimle...@gmail.com> wrote:


Hi Seyet Ali,
If you have created the data frame, you probably know that "Gender",
"Hand" and "Gr" are the names of the vectors of values that are joined
in the data frame "MyData". You now wish to change those names. I
don't know why you would change the names to obscure ones like "V1",
but I suggest a look at the "names" function. The answer to your
question should now be clear to you.

Jim

On Mon, Dec 28, 2020 at 7:25 AM Seyit Ali KAYIS
<seyitali.ka...@ibu.edu.tr> wrote:


Dear R users,

  �

I have a data frame as below. In part 1, I have created a table for Gender and 
Hand, performed Chi-Square test and made graph using ggplot.

  �

I want to replace the original variable names (Gender and Hand) with V1 and V2 
and to be able to perform those things again as in #part 2. Is there a way to 
be able to replace the original names?

  �

Any help is deeply appreciated

  �

Kind Regards

  �

Seyit Ali

  �

#############################################################################

  �

MyData<-data.frame("Gender" = c("F",     "F",        "F",        "F",        "M",      "M",              "M",      "M", 
     "M",      "M",      "F",        "F"),

                    "Hand" = c("R",           "R",        "L",        "L",        "R",        "R",        "L",              
"L",        "R",        "R",        "L",        "L"),

                    "Gr" = c(1,      2,           1,           2,           1,  
         2,           1,           2,              1,           2,           1,           
2) )



MyData <- within(MyData, {

   Gender  <- factor(Gender)

   Hand <- factor(Hand)

   Gr   <- factor(Gr)

}

)

  �

str(MyData)

  �

library(ggplot2)

  �

#################     Part 1  #########################################

  �

MyT <- table(MyData$Gender, MyData$Hand)

print(MyT)

  �

MyChi<- chisq.test(MyT)

print(MyChi)

dMyT <- data.frame(as.table(as.matrix(table(MyData$Gender, MyData$Hand, useNA = 
"ifany"))))

name2<- c("Gender", "Hand", "Frequency")

names(dMyT) <- name2

  �

ggplot(data = na.omit(dMyT), aes(fill=Hand, y=Frequency, x=Gender)) +

     geom_bar(position="dodge", stat="identity")

  �

#################  Part 2   ################

  �

# I want to be able to pass Gender and Hand as V1 and V2 , respectively to

# table, Chi-Square test and ggplot

  �

V1 <- "Gender"

V2 <- "Hand"

  �

MyT2 <- table(MyData$V1, MyData$V2)

  �

print(MyT)

  �

MyChi<- chisq.test(MyT)

print(MyChi)

dMyT <- data.frame(as.table(as.matrix(table(MyData$V1, MyData$V2, useNA = 
"ifany"))))

name2<- c(V1, V2, "Frequency")

names(dMyT) <- name2

  �

ggplot(data = na.omit(dMyT), aes(fill=V2, y=Frequency, x=V1)) +

     geom_bar(position="dodge", stat="identity")

  �

  �

  �

  �

----------------------------------------------------

Dr. Seyit Ali KAYIS

Bolu Abant Izzet Baysal University, Faculty of Medicine

Department of Biostatistics and Medical Informatics

Bolu, Turkey



  <mailto:s_a_ka...@yahoo.com> s_a_ka...@yahoo.com,  
<mailto:s_a_ka...@hotmail.com> s_a_ka...@hotmail.com

Tel: +90 374 254 30 32 Mobile: +90 535 587 1139



Greetings from Bolu, Turkey

------------------------------------------------------

  �


         [[alternative HTML version deleted]]

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______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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Re: [R] Passing variable name

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