Table 1.

Response rates in the WLS

	Graduate sample				Sibling sample
	Sample frame	Deceased	Completed interviews	Response rate	Sample framea	Deceased	Completed interviews	Response rate
1957	10 317		10 317	100%
1964
Mail	10 317	71	8922	90%
1975
Mail	10 317	175	9138	92%	2438	9	2133	87.81%
1993
Phone	10 317	587	8493	86%	7812	462	4804	65.36%
Mail	10 317	587	6845	69%	7812	462	4065	55.31%
Either phone or mail	10 317	587	8493	86%	7812	462	5365	72.99%
2004
Phone	10 317	1288	7265	73%	7928	1226	4298	64.13%
Mail	10 317	1288	6845	69%	7928	1226	4004	59.74%
Either phone or mail	10 317	1288	7732	78%	7928	1226	4703	70.17%
2004 spouse	7483	22	4076	58%	5750	22	2180	38.06%

^aThe sample frame for siblings for 1975 was a 1/3 random sample of one random living sibling for each graduate with a sibling. The 1993 eligible sibling sample excluded: siblings who were in the 1975 sample frame, but were not interviewed; siblings of graduates not interviewed in 1975; and interviews not completed owing to lacking funds. The 2004 eligible siblings sample excluded: siblings who were in the 1975 and/or 1993 sample frame, but were not interviewed; siblings of graduates not interviewed in 1975 or 1993.