climber_drugs R Documentation

## Climber Drugs Data.

### Description

Anonymous data was collected from urine samples at huts along the climb of Mont Blanc. Several types of drugs were tested, and proportions were reported.

### Usage

climber_drugs


### Format

A data frame with 211 rows and 6 variables.

positive_sample

Idendification number of a specific urine sample.

hut

Location where the sample was taken.

substance

Substance detected to be present in the urine sample.

concentration

Amount of substance found measured in ng/ml.

screening_analysis

Indicates that the concentration was determined by screening analysis.

concomitant

Indicates that this substance was always detected concomitantly with the previous one, within the same urine sample.

### Examples

library(dplyr)

# Calculate the average concentration of each substance and number of occurrences.
climber_drugs %>%
group_by(substance) %>%
summarize(count = n(), mean_con = mean(concentration))

# Proportion samples in which each substance was detected.
climber_drugs %>%
group_by(substance) %>%
summarize(prop = n() / 154)