00325nam a2200121 a 450000500170000002000150001708200150003210000230004724500440007026000470011430000230016150000190018420251203110742.0  a0521671051  a519.5bFRE  aFreedman David, A.  aStatistical ModelsbTheory and Practice  aNew YorkbCambridge Univeristy Pressc2005  ax,414p.c26 cm. PB  aincludes index