![Full text] Thoracic Imaging at Exacerbation of Chronic Obstructive Pulmonary Dise | COPD](https://www.dovepress.com/cr_data/article_fulltext/s250000/250746/img/COPD_A_250746_T0001_11.jpg "Full text] Thoracic Imaging at Exacerbation of Chronic Obstructive Pulmonary Dise | COPD")
Full text] Thoracic Imaging at Exacerbation of Chronic Obstructive Pulmonary Dise | COPD
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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")
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
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![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/CCPgZ.png "Error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]) : contrasts can be applied only to factors with 2 or more levels - Stack Overflow")
Error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]) : contrasts can be applied only to factors with 2 or more levels - Stack Overflow
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