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Activity Counts from a Data Frame

Source: R/read_csv.R
counts.from.data.frame.Rd

A device-neutral entry point: pull a count column (and optionally a time column) out of any data frame and return a tidy timestamp/counts frame ready for the analysis functions. Use it for non-ActiGraph counts or any pre-extracted series.

Usage

counts.from.data.frame(
  df,
  count_col = "axis1",
  time_col = NULL,
  epoch_length = 60,
  tz = "UTC",
  start = "1970-01-01"
)

Arguments

df

A data frame.

count_col

Name or index of the count column (default "axis1").

time_col

Name or index of the timestamp column; if NULL, timestamps are synthesized from start by epoch_length (with a warning).

epoch_length

Epoch length in seconds for synthesized timestamps (default 60).

tz

Time zone (default "UTC").

start

Start time for synthesized timestamps (default "1970-01-01").

Value

A data frame with timestamp (POSIXct) and counts.

See also

read.actigraph.csv

Examples

df <- data.frame(activity = c(0, 50, 300), clock = c("2024-01-01 00:00:00",
  "2024-01-01 00:01:00", "2024-01-01 00:02:00"))
counts.from.data.frame(df, count_col = "activity", time_col = "clock")
#>             timestamp counts
#> 1 2024-01-01 00:00:00      0
#> 2 2024-01-01 00:01:00     50
#> 3 2024-01-01 00:02:00    300