R 과소표집

1 개요

R undersampling

R 과소표집, R 언더샘플링

df = read.table( header=TRUE, stringsAsFactors=FALSE, text="
name  major gpa
Alice Math  3.3
Bob   Math  3.4
Carol Math  3.5
Dave  Math  3.6
Erin  Math  3.7
Frank Chem  3.8
Grace Chem  3.9
Heidi Chem  4.0
")
library(dplyr, warn.conflicts=F)
df_Math = df[df$major=="Math",]
df_Chem = df[df$major=="Chem",]
df_Math = sample_n(df_Math,3)
df = rbind(df_Math, df_Chem, make.row.names=FALSE)
print( df )

2 같이 보기

• 과소표집
• R 과대표집
• R rbind()
• R sample_n()