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# B Athletics
# 1.
# (a)
# getwd()
# setwd([workplace])
tnf100M <- read.csv("tnf100M.csv", header=TRUE)
tnf100W <- read.csv("tnf100W.csv", header=TRUE)
names(tnf100M)
# [1] "ID"       "time"    "wind"    "Name"    "country" "birth"    "heat"    "Location" "date"   
tnf100M$sex = 0
tnf100W$sex = 1
tnf100 <- rbind(tnf100M, tnf100W)

# (b)

#removehighaltitude
tnf100 <- tnf100[-grep("A",tnf100$time),]
#as.numeric()
tnf100$time=as.numeric( as.character(tnf100$time) )

# (c)
tnf100 <- tnf100[,c("country","date","birth","wind","time","sex")]

# (d)
# install.packages("lubridate")
library(lubridate)...

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