Sammenlign metoder

	Multivariat kontrolkort	Kontrolskema
Fagområde	Forsøgsdesign	Forsøgsdesign
Familie	Process / pipeline	Process / pipeline
Oprindelsesår	1947 (Hotelling T²); 1980s–1990s (MEWMA, MCUSUM extensions)	1924 (first use); 1931 (seminal book)
Ophavsperson	Harold Hotelling (multivariate foundation); extended by Lowry, Woodall, and others	Walter A. Shewhart (Bell Labs)
Type	Multivariate statistical process monitoring	Statistical monitoring and control technique
Oprindelig kilde	Hotelling, H. (1947). Multivariate quality control illustrated by the air testing of sample bombsights. In C. Eisenhart, M. W. Hastay, & W. A. Wallis (Eds.), Techniques of Statistical Analysis (pp. 111–184). McGraw-Hill.	Shewhart, W. A. (1931). Economic Control of Quality of Manufactured Product. Van Nostrand.
Aliasser	multivariate control chart, multi-response SPC, MRCC, multiple-response monitoring chart	Shewhart chart, process-behavior chart, SPC chart, quality control chart
Relaterede	6	6
Resumé	A multi-response control chart simultaneously monitors two or more correlated quality characteristics on a single chart, preserving the correlation structure that univariate charts ignore. Built on Hotelling's T² statistic and its time-weighted extensions (MEWMA, MCUSUM), it detects process shifts that would be missed if each response were charted independently. It is the standard tool in manufacturing and service quality when product performance depends on multiple interrelated outputs.	A control chart is a time-series graph with statistically derived upper and lower control limits that separates the natural, random variation of a process (common cause) from unusual, assignable variation (special cause). Invented by Walter Shewhart at Bell Labs in 1924, control charts remain the foundational tool of Statistical Process Control and are used across manufacturing, healthcare, software, and service industries to monitor whether a process remains stable and predictable over time.