00663nam a2200181Ia 4500008004100000020001800041022001300059040001300072082001800085100001900103245009000122260005100212300003300263500006500296650004200361650005300403700002500456191130s1999##################000#0#eng##  a9780805829631  a99019115  aACLcACL  a300.15118 HEC  aHeck, Ronald H  aAn introduction to multilevel modeling techniquescRonald H. Heck and Scott L. Thomas  aMahwah, NJbLawrence Erlbaum Associatescc1999  axiii, 209 p. : ill. ; 24 cm.  aIncludes bibliographical references (p. 193-199) and indexes  aSocial sciences - Mathematical models  aSocial sciences - Research - Mathematical models  aThomas, Scott Loring