# Define the function

Hello everybody!
I have to understand this code and don't know how to define this cut2.. the outcome said couldn't find the function. How do I do it? I have to work myself in in R again. I am very happy about your help !

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I totaly got the same problem. Any help out here??

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Hi Anna,

One place to start would be look at what packages were used to build the code. Do you know?

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Sure, I'm sorry, this is the code (the cut2 is down under "IV for numeric data"):

data1=data #To create a backup of original data

#------------------------------------Basic Exploration of the data--------------------------------------------#
str(data1)
summary(data1)
dim(data1)
data1\$SeniorCitizen<-as.factor(data1\$SeniorCitizen)
str(data1)

#-----------------------------------Missing Value Treatment (if any)-------------------------------------------#
data.frame(colSums(is.na(data1)))

#---->Substituting missing values with mean

data1[is.na(data1\$TotalCharges),19]=mean(data1\$TotalCharges,na.rm=T)

data.frame(colSums(is.na(data1)))

#--------------------------------Information Value Calculation (A variable reduction technique)----------------------------------#

#-----------> Creating two data sets for numeric and categorical values

## Data set with numeric variable

num <- data1[,-c(1:4,6:17)]#Numerical Data Frame
cat <- data1[,c(1:4,6:17,20)]#Categorical Data Frame
str(num)
str(cat)

#---------------------------------------IV for numeric data-------------------------------------------------------#

IVCal <- function(variable,target,data,groups)
{
data[,"rank"] <- cut2(data[,variable],g=groups)
tableOutput <-sqldf(sprintf("select rank,
count(%s) n,
sum(%s) good
from data
group by rank",target,target))
tableOutput <- sqldf("select *,
from tableOutput")
tableOutput\$good_rate<- tableOutput\$good/sum(tableOutput\$good)*100
IV <- sum(tableOutput\$IV[is.finite(tableOutput\$IV)])
IV1 <- data.frame(cbind(variable,IV))
return(IV1)
}

a1<- IVCal("tenure","Churn",num,groups=10)
a2<- IVCal("MonthlyCharges","Churn",num,groups=10)
a3<- IVCal("TotalCharges","Churn",num,groups=10)

IV_num<- data.frame(rbind(a1,a2,a3))
IV_num

And these are the packages i installed:
list.of.packages <- c("caret", "ggplot2", "MASS", "car", "mlogit", "caTools", "sqldf"," Hmisc", "aod", "BaylorEdPsych", "ResourceSelection", "pROC", "ROCR")

Does this cut2 have something to do with the packages?

If limit how much you post, it's easier to find your answer, so this:

would have been just right.

Do you know how to search for documentation in R? Are you familiar with the help functions `?` and `??` ?

No, I'm not. Then I will first inform me about that. Thanks!

To give you an example from the code you shared:

If you run the command `?read.csv`, the documentation for the `read.csv()` function will appear in the "Help" tab in the lower right. That works because `read.csv()` is part of the core of R and so is available every time you open RStudio.

However, if the function you're looking for is part of a package, you first need to run `library([name of package])` to load the package so that the function name is made available to you, and then run `?[name of function]`.

Lastly, if `?` doesn't work and you're not sure what package the function is from, you can run `??[name of function]`. That will produce a collection of links in the "Help" tab to documentation for similarly named functions.

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