installed.packages("readr")
##      Package LibPath Version Priority Depends Imports LinkingTo Suggests
##      Enhances License License_is_FOSS License_restricts_use OS_type Archs
##      MD5sum NeedsCompilation Built
library(readr)

gilt <- read_csv("C:/Users/xiayangxiao/Downloads/GILTdata.csv")
## Parsed with column specification:
## cols(
##   zip = col_integer(),
##   time = col_double(),
##   age = col_integer(),
##   product = col_integer(),
##   MSRP = col_integer(),
##   discountCat = col_character()
## )
attach(gilt)
meanMSRP <- mean(MSRP)
meanMSRP
## [1] 380.625
aggregate(. ~ product, gilt[4:5], mean)
##   product MSRP
## 1       1 1090
## 2       2   75
## 3       3  670
## 4       4   90
## 5       5  270
## 6       6  331
## 7       7   89
## 8       8  430
sumplot <- aggregate(. ~ product, gilt[4:5], mean)
plot(sumplot)

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