My date column gives me NA values when I try to change the time series date format.
DATASET
:
Date IIP CPI Term.Spread RealMoney NSE50 CallMoneyRate
1 2013:01:00 107.2 104.6 -0.059420 81740.83 6023.117 8.001140
2 2013:02:00 101.4 105.3 0.119139 83898.19 5893.587 7.804981
3 2013:03:00 115.2 105.5 0.110670 85029.03 5782.261 7.899530
4 2013:04:00 102.6 106.1 0.262090 86276.79 5699.760 7.525810
5 2013:05:00 106.0 106.9 0.189202 87405.71 6064.522 7.291098
6 2013:06:00 101.3 109.3 0.220076 87329.72 5782.078 7.240324
#------> importing all libraries
library("lubridate")
# install.packages("forecast")
# install.packages("ggplot2")
library('ggplot2')
library('fpp')
library('forecast')
library('tseries')
# install.packages("vars")
library(xts)
#--------->reading data
inputData <- read.csv("C:/Users/sanat/Downloads/exercise_1.csv", header=T)
inputData$logIIP <- log(inputData$IIP)
head(inputData)
inputData$logCPI <- log(inputData$CPI)
head(inputData)
inputData$CPI <- NULL
inputData$IIP <- NULL
head(inputData)
inputDate <- ts(start = 2013, end = 2018, frequency = 365)
#inputData$Date <- as.Date(class(inputData$Date), format = "%Y-%m")
#head(inputData)
Area of doubt(output gives NA values)
strptime(inputData$Date, format = "%m-%Y")
My inputData$Date give NA as output. How should i handle the DD-mm-yy hh:mm:ss format. I am a beginner in R.Kindly guide me through.
The reason it is failed is that the date cannot have a value 0
, it is in 1-31
range. To cope a problem you need to change last 0
into 1
, for example using stringr
package. Then using lubridate
package you can convert it into Date
format. Please see below:
# data simulation
Date <- expand.grid(2013:2018, c(paste0("0", 1:9), 10, 11, 12))
inputData <- data.frame(Date = sort(paste0(Date$Var1, ":", Date$Var2, ":", "00")))
# conversion
library(lubridate)
library(stringr)
str_sub(inputData$Date, -1, -1) <- "1"
inputData$Date <- ymd(inputData$Date)
str(inputData)
# 'data.frame': 72 obs. of 1 variable:
# $ Date: Date, format: "2013-01-01" "2013-02-01" ...
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.