var totalPosition ={}, totalCount={}, cardData={};
for(var i in rawData){
   if(rawData[i].bestOf&&rawData[i].bestOf==3&&rawData[i].gameStats&&rawData[i].gameStats[0]&&rawData[i].gameStats[0].deckSize==60) {
      var deck = rawData[i].playerDeck.mainDeck;
      var runningCount = 0;
      for(var n = 0; n<deck.length; n++){
         totalPosition[deck[n].id]=totalPosition[deck[n].id]||0;
         totalPosition[deck[n].id]+=(runningCount+deck[n].quantity/2-.5)*deck[n].quantity;
         totalCount[deck[n].id]=totalCount[deck[n].id]||0;
         totalCount[deck[n].id]+=deck[n].quantity;
         runningCount+=deck[n].quantity;
      }
   }
}
for(var x in totalPosition){
   cardData[x] = {
      count : totalCount[x],
      avgPosition : Math.round(totalPosition[x]/totalCount[x]*10)/10
   }
}

/* output:
 ID | Count | Average Position
 AVG   | -- | 30
 66057 | 12 | 12.5
 66067 | 9 | 16
 66091 | 6 | 19.5
 66109 | 12 | 15.8
 66125 | 9 | 7
 66207 | 50 | 13.4
 66223 | 271 | 34.8
 66325 | 100 | 32.5
 66363 | 517 | 10.5
 66401 | 540 | 17.8
 66415 | 158 | 23.9
 66433 | 125 | 31.3
 66483 | 3 | 18
 66485 | 168 | 38.5
 66509 | 10 | 37
 66517 | 20 | 44.5
 66533 | 40 | 34.5
 66709 | 2 | 16.5
 66781 | 113 | 28
 66889 | 533 | 20.8
 66901 | 12 | 45.7
 66939 | 12 | 13.2
 67007 | 36 | 58
 67019 | 240 | 18.5
 67023 | 596 | 25.6
 67106 | 40 | 37
 67224 | 6 | 0.5
 67266 | 258 | 33.4
 67284 | 13 | 7.6
 67444 | 3 | 51
 67502 | 91 | 21.8
 67584 | 269 | 45.5
 67588 | 197 | 43.1
 67590 | 6 | 3
 67594 | 6 | 4
 67598 | 12 | 3.5
 67600 | 491 | 54.5
 67992 | 12 | 22.5
 68096 | 347 | 29.3
 68112 | 9 | 26
 68180 | 52 | 43.1
 68184 | 10 | 57
 68202 | 20 | 58.5
 68310 | 520 | 5.6
 68502 | 4 | 13.5
 68506 | 3 | 28
 68530 | 40 | 34
 68538 | 100 | 27.7
 68569 | 12 | 30.5
 68615 | 3 | 33
 68624 | 12 | 35.5
 68636 | 18 | 27.5
 68653 | 6 | 38.5
 68666 | 158 | 20.8
 68674 | 52 | 36.2
 68688 | 12 | 41.5
 68691 | 2 | 57.5
 68694 | 387 | 38
 68709 | 1 | 48
 68714 | 12 | 32
 68724 | 4 | 39.5
 68732 | 4 | 31.5
 68734 | 540 | 48.8
 68736 | 4 | 43.5
 68738 | 12 | 45.5
 68740 | 344 | 52.7
 68742 | 21 | 51
 68744 | 15 | 57
 68745 | 20 | 40.5
 69131 | 4 | 1.5
 69168 | 4 | 9.5
 69230 | 2 | 16.5
 69250 | 5 | 53
 69254 | 4 | 19.5
 69259 | 5 | 52
 69277 | 6 | 30.7
 69306 | 19 | 50.7
 69311 | 365 | 7.7
 69380 | 4 | 5.5
 69391 | 4 | 27.5
 69394 | 168 | 34.5
 69397 | 3 | 35
 69398 | 1 | 37
 69405 | 4 | 47.5
*/