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Full text] Thoracic Imaging at Exacerbation of Chronic Obstructive Pulmonary Dise | COPD
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Error "contrasts can be applied only to factors with 2 or more levels" with missing_compare and finalfit() · Issue #51 · ewenharrison/finalfit · GitHub
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step 3a fails - contrasts can be applied only to factors with 2 or more levels · Issue #34 · microsoft/SQL-Server-R-Services-Samples · GitHub
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![Factor level Error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]) : contrasts can be applied only to factors with 2 or more levels - Stack Overflow](https://i.stack.imgur.com/cSinr.png "Factor level Error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]) : contrasts can be applied only to factors with 2 or more levels - Stack Overflow")