id = candidate ID
name = name (recorded in Japanese)
prefid = prefecture code (1-47)
pref = name of the prefecture
distnum = district id within the prefecture
party
   1--LDP
   2--DPJ
   3--New Komeito
   4--JCP
   5--SDP
  20--Kokumin Shinto (People's New Party)
  21--Shinto Nippon (New Party Nippon)
  22--Shinto Daichi (New Party Daichi)
  23--Kaikaku Kurabu (Japan Renaissance Party)
  24--Minna no to (Your Party)
  98--others
  99--independents

dual = also ran in PR (1) or not (0)
win = 0 lost; 1 lost in the SMD but won in PR; 2 won in the SMD
inc = incumbent (1) or not (0)
votes = the number of votes received
rank = rank of finish
tvotes = total number of votes
vshare = votes/tvotes*100
age = age

Source: 
<http://www.nikkei.co.jp>, accessed on August 30, 2009.