condense_period: Convert the Period to a Lower Periodicity (e.g. Go from Daily...

In timetk: A Tool Kit for Working with Time Series

Convert the Period to a Lower Periodicity (e.g. Go from Daily to Monthly)

Description

Convert a data.frame object from daily to monthly, from minute data to hourly, and more. This allows the user to easily aggregate data to a less granular level by taking the value from either the beginning or end of the period.

Usage

condense_period(.data, .date_var, .period = "1 day", .side = c("start", "end"))

Arguments

.data	A tbl object or data.frame
.date_var	A column containing date or date-time values. If missing, attempts to auto-detect date column.
.period	A period to condense the time series to. Time units are condensed using lubridate::floor_date() or lubridate::ceiling_date(). The value can be: second minute hour day week month bimonth quarter season halfyear year Arbitrary unique English abbreviations as in the lubridate::period() constructor are allowed: "1 year" "2 months" "30 seconds"
.side	One of "start" or "end". Determines if the first observation in the period should be returned or the last.

Value

A tibble or data.frame

See Also

Time-Based dplyr functions:

• summarise_by_time() - Easily summarise using a date column.

• mutate_by_time() - Simplifies applying mutations by time windows.

• pad_by_time() - Insert time series rows with regularly spaced timestamps

• filter_by_time() - Quickly filter using date ranges.

• filter_period() - Apply filtering expressions inside periods (windows)

• slice_period() - Apply slice inside periods (windows)

• condense_period() - Convert to a different periodicity

• between_time() - Range detection for date or date-time sequences.

• slidify() - Turn any function into a sliding (rolling) function

Examples

# Libraries
library(dplyr)

# First value in each month
m4_daily %>%
    group_by(id) %>%
    condense_period(.period = "1 month")

# Last value in each month
m4_daily %>%
    group_by(id) %>%
    condense_period(.period = "1 month", .side = "end")

timetk documentation built on Nov. 2, 2023, 6:18 p.m.