search for: t1n0

...want to thank you guys in advance for your help. I'm a cancer researcher and I need to learn R to complete a few projects. I have an introductory background in Python. My questions at the moment are based on the following sample input file: *Sample_Input_File* characteristics_ch1.3 Stage: T1N0 Stage: T2N1 Stage: T0N0 Stage: T1N0 Stage: T0N3 "characteristics_ch1.3" is a column header in the input excel file. "T's" represent stage and "N's" represent degree of disease spreading. I want to create output that looks like this: *Sample_Output_File*...