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Table 7 Item difficulty means values

From: Controlling item difficulty for automatic vocabulary question generation

   DWD.low DWD.high Row mean
RPD.low SIM.low .590 .557 .573
  SIM.high .559 .392 .475
  Mean .574 .474 .524
RPD.high SIM.low .583 .490 .536
  SIM.high .571 .388 .479
  Mean .577 .439 .507
  Column Mean .575 .456