Compute daily, month and annual average of several data sets

问题

I have a data frame:

MS_NR SS_NR      DATE       HOUR     VALUE
1 13095010    68 1/01/2014 0:00:00    9,8
2 13095010    68 1/01/2014 1:00:00    8,0
3 13095010    68 1/01/2014 2:00:00    NA
4 13095010    68 1/01/2014 3:00:00    7,5
5 13095010    68 1/01/2014 4:00:00    7,0
6 13095010    68 1/01/2014 5:00:00    8,5

are temperature observations of a weather station taken every hour, I want to calculate the daily, weekly, monthly and annual averages of several data frames of different weather stations. How can I do this within a loop, so that the process is not repetitive?

回答1:

When working with hydro-meteorological data, I usually use xts and hydroTSM packages as they have many functions for data aggregation.

You didn't provide any data so I created one for demonstration purpose

library(xts)
library(hydroTSM)

# Generate random data
set.seed(2018)
date = seq(from = as.Date("2016-01-01"), to = as.Date("2018-12-31"),
           by = "days")
temperature = runif(length(date), -15, 35)
dat <- data.frame(date, temperature)

# Convert to xts object for xts & hydroTSM functions
dat_xts <- xts(dat[, -1], order.by = dat$date)

# All daily, monthly & annual series in one plot
hydroplot(dat_xts, pfreq = "dma", var.type = "Temperature")

# Weekly average
dat_weekly <- apply.weekly(dat_xts, FUN = mean)
plot(dat_weekly)

# Monthly average
dat_monthly <- daily2monthly(dat_xts, FUN = mean, na.rm = TRUE)
plot.zoo(dat_monthly, xaxt = "n", xlab = "")
axis.Date(1, at = pretty(index(dat_monthly)),
          labels = format(pretty(index(dat_monthly)), format = "%b-%Y"),
          las = 1, cex.axis = 1.1)

# Seasonal average: need to specify the months
dat_seasonal <- dm2seasonal(dat_xts, season = "DJF", FUN = mean, na.rm = TRUE)
plot(dat_seasonal)

# Annual average
dat_annual <- daily2annual(dat_xts, FUN = mean, na.rm = TRUE)
plot(dat_annual)

Edit: using OP's data

df <- readr::read_csv2("Temp_2014_Hour.csv")
str(df)

# Convert DATE to Date object & put in a new column
df$date <- as.Date(df$DATE, format = "%d/%m/%Y")
dat <- df[, c("date", "VALUE")]
str(dat)

dat_xts <- xts(dat[, -1], order.by = dat$date)

Created on 2018-02-28 by the reprex package (v0.2.0).

回答2:

I try this

first using read.table load the file

library(openair)

Temp <- read.table (file, header=TRUE, sep=";",stringsAsFactors = FALSE, dec = ",", na.strings = "NA")

tiempos <- Temp$HOUR
timestamps <- as.POSIXlt(as.POSIXct('1900-1-1', tz='UTC') 
                         + as.difftime(as.character(tiempos))
time <- format(timestamps, format='%H:%M:%S')
date<-paste(Temp[,3], time, sep=" ")
date

Temp_met <- cbind(date, CovTemp[-c(3,4)])
Temp_met$date <- as.POSIXct(strptime(Met_CovTemp$date,
                                                  format = "%d/%m/%Y %H:%M", "GMT"))

## daily mean
Temp_daily <- timeAverage(Met_CovTemp, avg.time = "day")
## weekly mean
Temp_week <- timeAverage(Met_CovTemp, avg.time = "week")
## monthly mean
Temp_month <- timeAverage(Met_CovTemp, avg.time = "month")
## annual mean
Temp_annual <- timeAverage(Met_CovTemp, avg.time = "year")

来源：https://stackoverflow.com/questions/49037858/compute-daily-month-and-annual-average-of-several-data-sets

标签

statistics

xts

hydrotsm