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Engineering Statistics Handbook Episode 6 Part 5

Tham khảo tài liệu 'engineering statistics handbook episode 6 part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 4.6.4.5. Cubic Cubic Rational Function Model _ 1.079 - 0.122z Ũ.ŨŨ4Ũ97X2 - Ũ.ŨŨŨŨŨ143X3 p 1 - Ũ.ŨŨ576T Ũ.ŨŨŨ241z2 - Ũ.ŨŨŨŨŨŨ123z3 Plot of C C Rational Function Fit We generate a plot of the fitted rational function model with the raw data. Thermal Expansion of Copper Data GC Rational Function Model Temperature degrees Kelvin The fitted function with the raw data appears to show a reasonable fit. 6-Plot for Model Validation Although the plot of the fitted function with the raw data appears to show a reasonable fit we need to validate the model assumptions. The 6-plot is an effective tool for this purpose. http www.itl.nist.gov div898 handbook pmd section6 pmd645.htm 3 of 5 5 1 2006 10 22 58 AM 4.6.4.5. Cubic Cubic Rational Function Model Residual Plot The 6-plot indicates no significant violation of the model assumptions. That is the errors appear to have constant location and scale from the residual plot in row 1 column 2 seem to be random from the lag plot in row 2 column 1 and approximated well by a normal distribution from the histogram and normal probability plots in row 2 columns 2 and 3 . We generate a full-sized residual plot in order to show more detail. http www.itl.nist.gov div898 handbook pmd section6 pmd645.htm 4 of 5 5 1 2006 10 22 58 AM