diff --git a/Derivative variable/dv.r b/Derivative variable/dv.r
new file mode 100644
index 0000000..ed489c9
--- /dev/null
+++ b/Derivative variable/dv.r	
@@ -0,0 +1,14 @@
+install.packages("hflights")
+install.packages("dplyr")
+library(hflights)
+library(dplyr)
+
+str(hflights)
+
+colnames(hflights)
+hflight_df = tbl_df(hflights)
+hflight_df
+
+# gain이라는 컬럼명의 ArrDelay - DepDelay 값의 파생변수 생성
+aa = mutate(hflight_df, gain=ArrDelay-DepDelay)
+aa
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