data(bike_accidents)
bike_accidents$Date <- as.POSIXct(bike_accidents$Date, format = "%Y/%m/%d")
start <- min(bike_accidents$Date)
diff <- as.integer(difftime(bike_accidents$Date , start, units = "days"))
density <- tkde(diff, rep(1,length(diff)), seq(0,max(diff),1), 2, "quartic")
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