Join tables based on events occurring in sequence in a funnel.
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README.md

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Disclaimer: funneljoin is still in development. While we are frequently using it at DataCamp, there might be some bugs, especially with remote tables. If you can, we recommend pulling your data to work with locally. And do not do multiple funnel joins in a row remotely; you will get an error (it's fine locally).

Overview

The goal of funneljoin is to make it easy to analyze behavior funnels. For example, maybe you're interested in finding the people who visit a page and then register. Or you want all the times people click on an item and add it to their cart within 2 days.

You can do this with funneljoin's after_join() function. The arguments are:

  • x: a dataset with the first set of behaviors.
  • y: a dataset with the second set of behaviors.
  • by_time: a character vector to specify the time columns in x and y. This would typically be a datetime or a date column. These columns are used to filter for time y being after time x.
  • by_user: a character vector to specify the user or identity columns in x and y.
  • mode: the method used to join: "inner", "full", "anti", "semi", "right", "left". You can also use after_mode_join instead (e.g. after_inner_join instead of after_join(..., mode = "inner"))
  • type: the type of funnel used to distinguish between event pairs, such as "first-first", "last-first", "any-firstafter". See types of funnels for details.
  • max_gap (optional): the maximum gap between events. Can be a integer representing the number of seconds between events or a difftime object.
  • gap_col (optional): whether to return a numeric column, .gap, with the time difference in seconds between the events. Defaults to FALSE.

As funneljoin uses dplyr, it can also work with remote tables, but has only been tried on postgres. Some of the functionality, especially the gap joins, use SQL code that may not work with different versions.

Installation

You can install the development version from GitHub with:

# install.packages("devtools")
devtools::install_github("datacamp/funneljoin")

Types of funnels

type can be any combination of first, last, any, and lastbefore with first, last, any, and firstafter. Some common ones you may use include:

  • first-first: Take the earliest x and y for each user before joining. For example, you want the first time someone entered an experiment, followed by the first time someone ever registered. If they registered, entered the experiment, and registered again, you do not want to include that person.
  • first-firstafter: Take the first x, then the first y after that. For example, you want when someone first entered an experiment and the first course they started afterwards. You don't care if they started courses before entering the experiment.
  • lastbefore-firstafter: First x that's followed by a y before the next x. For example, in last click paid ad attribution, you want the last ad someone clicked before the first subscription they did afterward.
  • any-firstafter: Take all Xs followed by the first Y after it. For example, you want all the times someone visited a homepage and their first product page they visited afterwards.
  • any-any: Take all Xs followed by all Ys. For example, you want all the times someone visited a homepage and all the product pages they saw afterward.

See the vignette for more examples.

Example

library(dplyr)
#> 
#> Attaching package: 'dplyr'
#> The following objects are masked from 'package:stats':
#> 
#>     filter, lag
#> The following objects are masked from 'package:base':
#> 
#>     intersect, setdiff, setequal, union
library(funneljoin)
landed <- tibble::tribble(
  ~user_id, ~timestamp,
  1, "2018-07-01",
  2, "2018-07-01",
  3, "2018-07-02",
  4, "2018-07-01",
  4, "2018-07-04",
  5, "2018-07-10",
  5, "2018-07-12",
  6, "2018-07-07",
  6, "2018-07-08"
) %>%
  mutate(timestamp = as.Date(timestamp))

registered <- tibble::tribble(
  ~user_id, ~timestamp,
  1, "2018-07-02",
  3, "2018-07-02",
  4, "2018-06-10",
  4, "2018-07-02",
  5, "2018-07-11",
  6, "2018-07-10",
  6, "2018-07-11",
  7, "2018-07-07"
) %>%
  mutate(timestamp = as.Date(timestamp))

Let's say we wanted to get only the first time people landed and registered. We would use a first-first inner join:

landed %>%
  after_inner_join(registered, 
                   by_user = "user_id",
                   by_time = "timestamp",
                   type = "first-first")
#> # A tibble: 4 x 3
#>   user_id timestamp.x timestamp.y
#>     <dbl> <date>      <date>     
#> 1       1 2018-07-01  2018-07-02 
#> 2       3 2018-07-02  2018-07-02 
#> 3       6 2018-07-07  2018-07-10 
#> 4       5 2018-07-10  2018-07-11

If your time and user columns have different names, you can work with that too:

landed <- landed %>%
  rename(landed_at = timestamp,
         user_id_x = user_id)

registered <- registered %>%
  rename(registered_at = timestamp,
         user_id_y = user_id)
landed %>%
  after_inner_join(registered, 
                   by_user = c("user_id_x" = "user_id_y"),
                   by_time = c("landed_at" = "registered_at"),
                   type = "first-first")
#> # A tibble: 4 x 3
#>   user_id_x landed_at  registered_at
#>       <dbl> <date>     <date>       
#> 1         1 2018-07-01 2018-07-02   
#> 2         3 2018-07-02 2018-07-02   
#> 3         6 2018-07-07 2018-07-10   
#> 4         5 2018-07-10 2018-07-11

Summarizing funnels

Funneljoin also contains two functions to summarize funnels: summarize_conversions() and summarize_prop_tests()- see the vignette for details.

Reporting bugs and adding features

If you find any bugs or have a feature request or question, please create an issue. If you'd like to add a feature, tests, or other functionality, please also make an issue first and let's discuss!