/O3-Nowcast

Estimates and predicts AQI in real time. Putting the "now" in AQI

Primary LanguageR

O3-Nowcast

Background

For more detail on why this repo exists as well as methods used see the attached whitepaper.

Setup

This repo has a few dependencies which can be installed by running.

Rscript Setup.r

File overview

  • Example.r

    • Top level script that performs some overhead and calls the other pieces to run on example dataset

  • NowcastFun.r

    • Functions related to calculations are defined here. As of 5/2/19 these include: The PLS Nowcast functions, the surrogate by linear regression, and counting max consecutive NA's in the data stream.

  • GetNowcast.r

    • Contains the GetNowcast() function. This goes through a decision tree based on properties of the data to decide whether a Nowcast is obtained via the PLS model, the surrogate regression, or 0 or previous hours' Nowcast value are used. Output is a single row'ed data.frame containing the date and Nowcast of the current hour. Calls on functions defined in NowcastFun.r.

  • RunNowcast_local_v2.r

    • Contains the run.nowcast() function to apply the Nowcast calculation to a data stream, exemplified in Example.r.

  • ExampleData.csv

    • Example data upon which the Nowcast is calculated by Example.r