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A Method for the Statistical Analysis of a Changeable Independent Variable in a Batch Process
Author(s) -
Koons G. F.,
Geissler J. J.,
Perlic B.
Publication year - 1979
Publication title -
journal of the royal statistical society: series c (applied statistics)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.205
H-Index - 72
eISSN - 1467-9876
pISSN - 0035-9254
DOI - 10.2307/2346810
Subject(s) - variable (mathematics) , variables , mathematics , statistical analysis , process (computing) , statistics , process variable , algorithm , computer science , mathematical analysis , operating system
Summary A changeable independent variable is defined as one that assumes more than one level during an experimental trial or production run. When the values assumed by the variable are plotted against time, the resulting curve is called the profile of the variable. A statistical technique has been developed for assessing the effect of the profile of a changeable independent variable on process performance. The method is to represent the profile by a linear sum of orthogonal polynomials and to use their coefficients in the subsequent statistical analysis.