Subset a journey table

Behaves exactly like subsetting a data frame, with one addition: if the result no longer carries the columns that make a journey table a journey table, the mm_paths class is dropped and a plain data frame is returned. This stops a column subset from producing an object that claims to be an mm_paths but cannot answer any question about journeys.

Usage

# S3 method for class 'mm_paths'
x[...]

Arguments

x

An mm_paths object.

...

Passed to the data frame method.

Value

An mm_paths object when the structural columns survive, otherwise a plain data frame.

Details

When a row subset removes part of a journey – dropping one channel, say – touch_rank and touch_n are recomputed from the touches that remain, so the result is a valid journey table in its own right and every credit rule sums to 1 per converting journey. The first remaining touch becomes rank 1. Convert with as.data.frame() first if you want to inspect the original ranks of a partial selection.

See also

build_paths(), path_summary()

Examples

data(mm_events)
paths <- build_paths(mm_events, id = "customer_id", channel = "channel",
                     timestamp = "timestamp", conversion = "conversion")

# Row subset: still a journey table
class(paths[paths$converted, ])
#> [1] "mm_paths"   "data.frame"

# Column subset that drops the structure: plain data frame
class(paths[, c("channel", "touch_rank")])
#> [1] "data.frame"