Usage Note 37932: When doing a screening analysis using Fit Model, what are the "Orthog Coded" and "Orthog t-Ratio" columns?
The "Orthog Coded" and "Orthog t–Ratio" columns are displayed when doing effect screening for a model with correlated parameter estimates.
The "Orthog Coded" column shows orthogonalized estimates. These are used in the pareto plot because this plot partitions the sum of the effects and partitioning requires orthogonality. These are computed by premultiplying the column vector of Original estimates by the transformation matrix shown in the Transformation to make uncorrelated report and then dividing the result by 2. The transformation matrix is the Cholesky root of X`X. These estimates depend on the model order unless the original design is orthogonal.
The "Orthog t-Ratio" values are constructed to make the parameter estimates independent and identically distributed. These are used in the normal plot, which requires these properties. The p–values associated with these estimates (given in the Prob>|t| column) are equivalent to type I sequential tests. Consequently, if the parameters of the model are correlated, these estimates and their p–values depend on the order of terms in the model. These estimates are computed by dividing the orthogonalized estimates ("Orthog Coded" estimates) by the Coded Scale Lenth PSE.
Operating System and Release Information
|Product Family||Product||System||SAS Release|
|JMP Software||JMP software||Microsoft Windows 8.1 Enterprise x64|
|Microsoft Windows 8.1 Enterprise 32-bit|
|Microsoft Windows 8 Pro x64|
|Microsoft Windows 8 Pro 32-bit|
|Microsoft Windows 8 Enterprise x64|
|Microsoft Windows 8 Enterprise 32-bit|
|Macintosh on x64|
|Windows 7 Ultimate x64|
|Windows 7 Ultimate 32 bit|
|Windows 7 Professional x64|
|Windows 7 Professional 32 bit|
|Windows 7 Home Premium x64|
|Windows 7 Home Premium 32 bit|
|Windows 7 Enterprise x64|
|Windows 7 Enterprise 32 bit|
|Microsoft Windows 10|
|Microsoft Windows 8.1 Pro x64|
|Microsoft Windows 8.1 Pro 32-bit|
|Date Modified:||2009-11-20 12:06:26|
|Date Created:||2009-11-20 11:05:50|