sample_session_duration {grizbayr}

Sample Session Duration

Description

Adds 2 new nested columns to the input_df: 'gamma_params' and 'samples' 'gamma_params' in each row should be a tibble of length 2 (k and \theta parameters) 'samples' in each row should be a tibble of length 'n_samples'

Usage

sample_session_duration(input_df, priors, n_samples = 50000)

Arguments

input_df

Dataframe containing option_name (str), sum_sessions (dbl), and sum_duration (dbl).

priors

Optional list of priors k0 and theta0. Default Gamma(1, 250) will be use otherwise.

n_samples

Optional integer value. Defaults to 50,000 samples.

Details

See update_rules vignette for a mathematical representation.

duration_i ~ Exponential(\lambda)

\lambda ~ Gamma(k, \theta)

Session Duration is sampled from a Gamma distribution with a Exponential likelihood of an individual leaving the site or ending a session at time t.

This is not always the case, so verify your data follows the shape of an exponential distribution before using this.

Value

input_df with 2 new nested columns 'gamma_params' and 'samples'