The performance of a modified EWMA control chart for monitoring autocorrelated PM2.5 and carbon monoxide air pollution data

PeerJ

article

Yadpirun Supharakonsakun¹  Yupaporn Areepong¹  Saowanit Sukparungsee¹ 

[1] Department of Applied Statistics, King Mongkut’s University of Technology North Bangkok

关键词: Autocorrelation;    Average run length;    Explicit formulas;    PM2.5;    Carbon monoxide;    Air pollutant;   

DOI  :  10.7717/peerj.10467

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

PM2.5 (particulate matter less than or equal to 2.5 micron) is found in the air and comprises dust, dirt, soot, smoke, and liquid droplets. PM2.5 and carbon monoxide emissions can have a negative impact on humans and animals throughout the world. In this paper, we present the performance of a modified exponentially weighted moving average (modified EWMA) control chart to detect small changes when the observations are autocorrelated with exponential white noise through the average run length evaluated (ARLs) by explicit formulas. The accuracy of the solution was verified with a numerical integral equation method. The efficacy of the modified EWMA control chart to monitor PM2.5 and carbon monoxide air pollution data and compare its performance with the standard EWMA control chart. The results suggest that the modified EWMA control chart is far superior to the standard one.

【 授权许可】

CC BY