Functions that support a broad range of common tasks in physical
    activity research, including but not limited to creation of Bland-Altman
    plots (<doi:10.1136/bmj.313.7049.106>), metabolic calculations such as basal
    metabolic rate predictions (<https://europepmc.org/article/med/4044297/reloa>),
    demographic calculations such as age-for-body-mass-index percentile
    (<https://www.cdc.gov/growthcharts/cdc_charts.htm>), and analysis of bout
    detection algorithm performance (<https://pubmed.ncbi.nlm.nih.gov/34258524/>).

A cohesive framework for the spectral and spatial analysis of 
    colour described in Maia, Eliason, Bitton, Doucet & Shawkey (2013) 
    <doi:10.1111/2041-210X.12069> and Maia, Gruson, Endler & White (2019)
    <doi:10.1111/2041-210X.13174>.

Functions to process, format and store ActiGraph GT1M and GT3X accelerometer data.

Interface to Amazon Web Services <https://aws.amazon.com>,
    including storage, database, and compute services, such as 'Simple
    Storage Service' ('S3'), 'DynamoDB' 'NoSQL' database, and 'Lambda'
    functions-as-a-service.

Interface to 'Amazon Web Services' 'analytics' services,
    including 'Elastic MapReduce' 'Hadoop' and 'Spark' big data service,
    'Elasticsearch' search engine, and more <https://aws.amazon.com/>.

Interface to 'Amazon Web Services' application integration
    services, including 'Simple Queue Service' ('SQS') message queue,
    'Simple Notification Service' ('SNS') publish/subscribe messaging, and
    more <https://aws.amazon.com/>.

Functions for making low-level API requests to Amazon Web Services
    <https://aws.amazon.com>. The functions handle building, signing, and
    sending requests, and receiving responses. They are designed to help build 
    higher-level interfaces to individual services, such as Simple Storage
    Service (S3).

Interface to 'Amazon Web Services' compute services,
    including 'Elastic Compute Cloud' ('EC2'), 'Lambda'
    functions-as-a-service, containers, batch processing, and more
    <https://aws.amazon.com/>.