Add Stay IDs with Temporal Thresholds

Adds stay IDs to a data frame, considering changes in spatial indices. Should only be applied on a single route, not multiple. Using add_stay_id_with_varied_intervals(), rather than add_stay_id(): It takes date as input so account for varying intervals, if the data is not sampled in the same frequency.

Usage

add_stay_id_with_varied_intervals(
  df,
  date_col = "date",
  timediff_unit = "days"
)

Arguments

df

A data frame with spatial and temporal data.

date_col

The name of the column containing the date information. Defaults to "date".

timediff_unit

The unit of stay_len.

Value

A data frame with stay_id and stay_len columns added.

Examples

routes <- data.frame(list(
  route_id = c(1, 1, 1, 2, 2, 3, 3, 3),
  i = as.integer(c(1, 1, 2, 2, 3, 4, 4, 5)), # Spatial index
  date = as.Date(c(
    "2010-01-01", "2010-01-02", "2010-01-05", "2010-01-06",
    "2010-01-10", "2010-01-15", "2010-01-16", "2010-01-20"
  )) # Time steps with varying intervals
))
df_with_varied_stay_ids <-
 add_stay_id_with_varied_intervals(routes, "date", "days")