sandbox/calc_acc.R

        "CD" "nonIBD" "UC"
"CD"     21     7      0
"nonIBD" 1     74      0
"UC"     3      3     30

(21+74+30)/(21+7+1+74+3+30)

         "CD" "nonIBD" "UC"
"CD"      251    56     5
"nonIBD"    5    20     0

(251+20) / (251+56+5+5+20)
5 / (251+56+5+5+20)

56/(251+56+5+5+20)

        "CD" "nonIBD" "UC"
"CD"     37    49      1
"nonIBD"  0    20      0
"UC"      1     2     45
(37+20+45)/(37+20+45+49+1+1+2)
49/(37+20+45+49+1+1+2)
2/(37+20+45+49+1+1+2)