ObsNumbs: Create observation numbers in your data

In EMAtools: Data Management Tools for Real-Time Monitoring/Ecological Momentary Assessment Data

Create observation numbers in your data

Description

This function allows you number your observations by participant (P), by day (D) or by participant and day (PD) using a unix (numeric) timestamp

Usage

ObsNumbs(ID, TS, BY = c("P", "D", "PD"))

Arguments

ID	name of ID variable
TS	name unix (numeric) timestamp (if you have a date-time object, try converting it with as.numeric(as.POSIXct()))
BY	participant (P), by day (D), or by participant and day (PD). P will create a column of just 1 through n responses for each participant. D will create a day-level sequential value. PD will create an observation within each day. This might be most useful by first using the BY=D option, which will give you day number to use in tandem with observation #.

Value

A column in your dataframe (with person-centered data)

Examples

df <- data.frame(
  ID = c(1, 1, 1, 2, 2),
  TS = as.numeric(as.POSIXct(
    c("2020-01-01 09:00", "2020-01-01 17:00", "2020-01-02 09:00",
      "2020-01-01 10:00", "2020-01-02 10:00"), tz = "UTC")))
df$ObsNumb   <- ObsNumbs(df$ID, df$TS, BY = "P")
df$DayNumb   <- ObsNumbs(df$ID, df$TS, BY = "D")
df$ObsNumb_D <- ObsNumbs(df$ID, df$TS, BY = "PD")

EMAtools documentation built on June 22, 2026, 5:08 p.m.