Passing variable name

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 <drjimlemon at 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.kayis at ibu.edu.tr> wrote:

Dear R users,

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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.

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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?

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Any help is deeply appreciated

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Kind Regards

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Seyit Ali

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

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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)

}

)

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str(MyData)

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library(ggplot2)

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

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

print(MyT)

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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

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

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

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

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

# table, Chi-Square test and ggplot

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V1 <- "Gender"

V2 <- "Hand"

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

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print(MyT)

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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

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

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

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

Dr. Seyit Ali KAYIS

Bolu Abant Izzet Baysal University, Faculty of Medicine

Department of Biostatistics and Medical Informatics

Bolu, Turkey



  <mailto:s_a_kayis at yahoo.com> s_a_kayis at yahoo.com,  <mailto:s_a_kayis at hotmail.com> s_a_kayis at hotmail.com

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



Greetings from Bolu, Turkey

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