There were 50 or more warnings (use warnings() to see the first 50)
          used (Mb) gc trigger  (Mb) limit (Mb)  max used   (Mb)
Ncells 1412728 75.5    3400714 181.7         NA   3400714  181.7
Vcells 9544033 72.9   86361158 658.9      65536 168664396 1286.9
Quality: 669, with subgroup label: 656

=== USDA Order vs Subgroup KSSL+NASIS ===
Order:    n=669  top1=0.338  CI=[0.300, 0.374]
Subgroup: n=656  top1=0.030  CI=[0.017, 0.044]

First 5 subgroup matches:
                  ref                 pred
     typic hapludults     typic hapludults
    typic dystrudepts    typic dystrudepts
   typic calciaquolls   typic calciaquolls
    typic endoaquolls    typic endoaquolls
 oxyaquic haplorthods oxyaquic haplorthods

First 5 subgroup misses:
                ref              pred
 aeric calciaquolls typic dystrudepts
 aeric calciaquolls aquic dystrudepts
  leptic natrudolls  typic eutrudepts
  leptic natrudolls  typic natrudalfs
   typic epiaquerts typic endoaquolls
