DOC: expanding comparison with R section
DOC: expanding comparison with R section

closes #12472
closes #9815

winklerand/pandas,linebp/pandas,jmmease/pandas,Winand/pandas,rs2/pandas,cython-testbed/pandas,jreback/pandas,pratapvardhan/pandas,MJuddBooth/pandas,cython-testbed/pandas,gfyoung/pandas,toobaz/pandas,MJuddBooth/pandas,gfyoung/pandas,pandas-dev/pandas,TomAugspurger/pandas,pandas-dev/pandas,linebp/pandas,jmmease/pandas,jmmease/pandas,dsm054/pandas,DGrady/pandas,Winand/pandas,gfyoung/pandas,TomAugspurger/pandas,louispotok/pandas,DGrady/pandas,harisbal/pandas,gfyoung/pandas,toobaz/pandas,winklerand/pandas,zfrenchee/pandas,jorisvandenbossche/pandas,datapythonista/pandas,cbertinato/pandas,amolkahat/pandas,nmartensen/pandas,cython-testbed/pandas,Winand/pandas,Winand/pandas,winklerand/pandas,jmmease/pandas,Winand/pandas,zfrenchee/pandas,pratapvardhan/pandas,MJuddBooth/pandas,jorisvandenbossche/pandas,TomAugspurger/pandas,TomAugspurger/pandas,zfrenchee/pandas,cbertinato/pandas,GuessWhoSamFoo/pandas,DGrady/pandas,dsm054/pandas,louispotok/pandas,datapythonista/pandas,pratapvardhan/pandas,DGrady/pandas,toobaz/pandas,winklerand/pandas,kdebrab/pandas,kdebrab/pandas,Winand/pandas,dsm054/pandas,toobaz/pandas,datapythonista/pandas,nmartensen/pandas,GuessWhoSamFoo/pandas,winklerand/pandas,louispotok/pandas,cbertinato/pandas,harisbal/pandas,zfrenchee/pandas,pandas-dev/pandas,rs2/pandas,jorisvandenbossche/pandas,cython-testbed/pandas,amolkahat/pandas,amolkahat/pandas,louispotok/pandas,gfyoung/pandas,jreback/pandas,dsm054/pandas,nmartensen/pandas,jreback/pandas,MJuddBooth/pandas,amolkahat/pandas,toobaz/pandas,jmmease/pandas,GuessWhoSamFoo/pandas,linebp/pandas,linebp/pandas,GuessWhoSamFoo/pandas,louispotok/pandas,rs2/pandas,nmartensen/pandas,jreback/pandas,harisbal/pandas,kdebrab/pandas,harisbal/pandas,dsm054/pandas,harisbal/pandas,pandas-dev/pandas,pratapvardhan/pandas,cbertinato/pandas,kdebrab/pandas,jmmease/pandas,DGrady/pandas,nmartensen/pandas,linebp/pandas,jorisvandenbossche/pandas,winklerand/pandas,rs2/pandas,zfrenchee/pandas,cbertinato/pandas,GuessWhoSamFoo/pandas,MJuddBooth/pandas,jreback/pandas,datapythonista/pandas,nmartensen/pandas,pratapvardhan/pandas,kdebrab/pandas,linebp/pandas,amolkahat/pandas,cython-testbed/pandas,DGrady/pandas