An A n a l y s i s o f t h e Accuracy of Spousal Reports G 55 h l & . & ~ \ o ~ \ c ~ G \ port rJd .TS November, 1985 Tom Smith NORC U n i v e r s i t y o f Chicago This r e s e a r c h was done f o r t h e General S o c i a l Survey p r o j e c t d i r e c t e d by' James A s Davis and Tom W. Smith. The p r o j e c t i s funded by t h e N a t i o n a l Science Foundation, Grant NOS SES-8118731. - 1- GSS :62 Like t h e p r o v e r b i a l h o r s e t r a d e r , s u r v e y r e s e a r c h e r s b e l i e v e i t i s b e s t t o "go s t r a i g h t t o t h e h o r s e ' s mouth." S e l f - r e p o r t s a r e a c c e p t e d a s t h e most a c c u r a t e , w h i l e proxy r e p o r t s by i n f o r m a n t s a r e c o n s i d e r e d less r e l i a b l e (Sudman and Bradburn, 1982). S e l f - r e p o r t s a r e judged s u p e r i o r because t h e i n d i v i d u a l e i t h e r h a s unique, p e r s o n a l knowledge of t h e s u b j e c t under i n q u i r y , such as a b o u t s u b j e c t i v e f e e l i n g s t a t e s o r a t t i t u d e s towards v a r i o u s i s s u e s , o r because t h e i n d i v i d u a l ' s r e c a l l of e v e n t s and p e r s o n a l e x p e r i e n c e s i s l i k e l y t o be more complete and d e t a i l e d . By f a r t h e most work h a s been done i n t h e a r e a of h e a l t h c a r e . Numerous s t u d i e s r e p o r t t h a t i n c i d e n t s of i l l n e s s , d i s a b i l i t y , p h y s i c i a n c a r e , and even h o s p i t a l i z a t i o n a r e u n d e r r e p o r t e d b y ' i n f o r m a n t s ( C a r t w r i g h t , 1957; C a n n e l l and Fowler, 1963; Haase and Wilson, 1972; Kovar and Wilson, 1976; Kovar and Wright, 1973; N i s s e l s o n and Woolsey, 1959; Marquis and C a n n e l l , 1971; and C a n n e l l , Marquis, and Laurent, 1977-but s e e t h e p a r t i a l c h a l l e n g e t o t h i s i n Andersen, Karper, F r a n k e l and A s s o c i a t e s , 1979). Various o t h e r s t u d i e s r e p o r t n o t a b l e v a r i a t i o n between proxy and s e l f r e p o r t s , b u t w i t h o u t t h e p r e s e n c e of v a l i d a t i o n c r i t e r i a t h a t makes it p o s s i b l e t o know which a r e a c t u a l l y more a c c u r a t e ( B a i l o r and Rothwell, 1984; Scanzoni; 1965; F e r b e r , 1955; Ballweg, 1969; C l a r k and Wallin, 1964; Brooks and B a i l o r , 1978; Haberman and E l i n s o n , 1967; and L e v i n g e r ) . S t u d i e s t h a t f i n d no d i f f e r e n c e between i n f o r m a n t and s e l f - r e p o r t s on some o r a l l v a r i a b l e s a r e comparatively r a r e (Ballweg, 1969; S i n g e r , 1972-73; and F e r b e r , 1955). Yet d e s p i t e t h e acknowledged s u p e r i o r i t y of s e l f - r e p o r t s , r e s e a r c h f r e q u e n t l y c o l l e c t s proxy i n f o r m a t i o n from informants. survey I n two s i t u a t i o n s proxy r e p o r t s a r e a c t u a l l y considered p r e f e r a b l e t o s e l f - r e p o r t s . They a r e favored when i n d i v i d u a l s a r e unable o r u n l i k e l y t o g i v e a s a c c u r a t e i n f o r m a t i o n a s an informed person c l o s e t o t h e i n d i v i d u a l . Most f r e q u e n t l y . GSS :62 -2- t h i s i n v o l v e s having p a r e n t s r e p o r t on t h e experiences (e.g. t h e i r minor c h i l d r e n ( N i s s e l s o n and Woolsey, 1959). h e a l t h c a r e ) of Similarly, caretakers a r e o f t e n interviewed about p a t i e n t s and charges who a r e p h y s i c a l l y o r mentally i n c a p a c i t a t e d (Singer, 1972-73). Second, i t i s believed ( b u t n o t a s f i r m l y e s t a b l i s h e d ) t h a t informant r e p o r t s about behaviors t h a t a r e t h r e a t e n i n g t o a respondent w i l l be more complete than s e l f - r e p o r t s (Bradburn, Sudman, and Associates, 1979; Sudman and Bradburn, 1982; Marquis and Cannell, 1971). It i s thought t h a t s o c i a l d e s i r a b i l i t y e f f e c t s w i l l cause respondents t o underreport t h e n e g a t i v e behavior (e.9. drug use, temper o u t b u r s t s , non- v o t i n g ) , while informants w i l l be less l i k e l y t o suppress t h e d e v i a n t behavior. These two circumstances however account f o r only a s m a l l p r o p o r t i o n of t h e i n s t a n c e s where surveys r e s o r t t o proxy r e p o r t s i n l i e u of s e l f - r e p o r t s . Overwhelmingly t h e motivation f o r using proxy r e p o r t s i s t h e i r g r e a t convenience and low cost. Interviewing each a d u l t i n a household i s u s u a l l y considered unnecessary when t h e information being sought is e i t h e r 1 ) household l e v e l information a c c e s s i b l e t o any a d u l t family member (e.g. family income, home tenancy, automobile ownership), 21 a j o i n t behavior shared w i t h t h e informant (e.g. number of hours s p e n t t o g e t h e r , d a t e of a c o u p l e ' s m a r r i a g e ) , o r 3 ) a b a s i c demographic o r observed behavior t h a t i s commonly known by household members (e.9. spouse's r e l i g i o n , employment s t a t u s , tobacco use, age). PROXY REPORTS FOR SPOUSES The General S o c i a l Surveys (GSS), which a r e n a t i o n a l f i l l 1 p r o b a b i l i t y samples of households, have followed t h e s e standard p r a c t i c e s . one random respondent per household ( u s i n g a Kish t a b l e ) . The GSS s e l e c t The s e l e c t e d respondents r e p o r t mostly on p e r s o n a l demographics, behaviors, and -3- GSS: 6 2 attitudes. Respondents a l s o r e p o r t on a s e t of household v a r i a b l e s (e.9. number of e a r n e r s , family income) and c e r t a i n c h a r a c t e r i s t i c s of t h e i r spouses. 1 While t h e GSS does n o t c o l l e c t any information t o v a l i d a t e t h e i n d i v i d u a l accuracy of proxy r e p o r t s about spouses, i t i s p o s s i b l e t o judge t h e i r aggregate accuracy by comparing them with s e l f - r e p o r t s . For married couples, t h e s e l f - r e p o r t s of t h e randomly s e l e c t e d respondents and of respondents1 spouses r e p r e s e n t t h e same u n i v e r s e (married p e o p l e ) and t h e r e f o r e t h e i r d i s t r i b u t i o n s should be t h e same. For example, f o r married couples t h e e d u c a t i o n a l d i s t r i b u t i o n r e p o r t e d by respondents should be t h e same a s t h e e d u c a t i o n a l d i s t r i b u t i o n t h a t respondents r e p o r t f o r t h e i r spouses. Using t h i s a s o u r s t a n d a r d of judgment, we compared s e l f and spouse r e p o r t s on t h e GSS. F i r s t , w e examined t h e completeness of information from respondents and spouses (Table 1 ) . Except f o r one t i e , more missing information o c c u r s f o r spouse r e p o r t s than s e l f - r e p o r t s . The higher l e v e l of missing information comes about e q u a l l y from more "no answers" - r e s u l t i n g from f a i l u r e t o ask follow-up q u e s t i o n s about t h e spouse, and higher l e v e l s of " d o n ' t knows" r e s u l t i n g from r e s p o n d e n t ' s l a c k of knowledge about t h e spouse. - On t h e o t h e r hand, even among spouse r e p o r t s , t h e l e v e l of information i s s o n e a r l y complete t h a t t h e r e l a t i v e l o s s of information i s t r i v i a l . Second, among t h o s e g i v i n g responses we compared d i s t r i b u t i o n s . Overall, t h e d i s t r i b u t i o n s were very c l o s e . Only f i v e of s i x t e e n comparisons were s i g n i f i c a n t l y d i f f e r e n t and given t h a t most comparisons involved s i x t o eleven thousand c a s e s , s i g n i f i c a n t d i f f e r e n c e s of unimpressive magnitude can 'Additional information i s c o l l e c t e d on p a r e n t s and respondent's family of o r i g i n , b u t we w i l l n o t be d e a l i n g with t h i s information. be d e t e c t e d . No d i f f e r e n c e s were d e t e c t e d on any df t h e SES v a r i a b l e s and r e l i g i o n showed no n o t a b l e d i f f e r e n c e s . some l a b o r f o r c e and e t h n i c i t y v a r i a b l e s . D i f f e r e n c e s d i d o c c u r , however, among mre f u l l - t i m e employment was r e p o r t e d f o r spouses t h a n f o r r e s p o n d e n t s (55.2% vs. 48.2%). S i m i l a r l y , more p e o p l e working over 34 hours i n the p r e v i o u s week are r e p o r t e d f o r spouses t h a n r e s p o n d e n t s (84.1% vs. 80.6%). I n c o n t r a s t t o the h i g h e r l e v e l of c u r r e n t l a b o r f o r c e involvement r e p o r t e d f o r s p o u s e s than f o r r e s p o n d e n t s , among t h o s e n o t c u r r e n t l y i n t h e l a b o r f o r c e r e s p o n d e n t s were more l i k e l y t o r e p o r t having worked f o r a y e a r o r more t h a n s p o u s e s (82.1% vs. 76.9%). The h i g h e r labor f o r c e p a r t i c i p a t i o n of spouses r e s u l t s from two forms of nonresponse bias: a n undersampling o f f u l l - t i m e employees i n t h e e a r l y block q u o t a s u r v e y s and an u n d e r r e p r e s e n t a t i o n of males on t h e f u l l - p r o b a b i l i t y surveys. Full-time employed people are u n d e r r e p r e s e n t e d on t h e block q u o t a samples t h a t were used i n 1972-1974 and on h a l f samples i n 1975 and 1976 (Stephenson, 1979). Conversely, males a r e u n d e r r e p r e s e n t e d on f u l l - p r o b a b i l i t y s u r v e y s t h a t were used on half-samples 1977-1 985 (Smith, 1979) . i n 1975 and 1976 and i n C o r r e c t i n g f o r e i t h e r t h e block q u o t a undersampling of f u l l - t i m e employees o r t h e f u l l p r o b a b i l i t y u n d e r r e p r e s e n t a t i o n of males r e d u c e s t h e g a p between spouse r e p o r t s and s e l f - r e p o r t s and when both a r e a d j u s t e d f o r s i m u l t a n e o u s l y t h e gap f a l l s from 4.0% t o 1.6% and becomes insignificant. For e t h n i c i t y r e s p o n d e n t s were a s k e d "From what c o u n t r i e s or p a r t of t h e world d i d your a n c e s t o r s come?" Up t o t h r e e mentions were recorded. p a r a l l e l q u e s t i o n was asked f o r spouses. A Considerably more e t h n i c i t i e s were mentioned by r e s p o n d e n t s t h a n they mentioned f o r t h e i r spouses. Respondents mention a n a v e r a g e of 1.54 c o u n t r i e s w h i l e f o r s p o u s e s o n l y 1.24 mentions were given. When w e used mentions a s t h e u n i t of a n a l y s i s , r e s p o n d e n t s mentioned -5- GSS: 62 more c o u n t r i e s from t h e f i r s t wave of immigrants (English, S c o t s , French, e t c . ) and fewer from l a t e r waves. s i g n i f i c a n t a t only the . I 1 d i f f e r e n c e t o be r e l i a b l e ) . (Although t h e d i f f e r e n c e of 4.1% i s l e v e l , w e b e l i e v e t h a t t h e 1986 GSS w i l l show this However, when w e used p r e f e r r e d e t h n i c i t y , t h e d i f f e r e n c e disappeared ( t o a d i f f e r e n c e of only 0.6%). I t appears t h a t respondents l a c k complete knowledge of t h e e t h n i c complexity and d i v e r s i t y of t h e i r p a r t n e r s (and t h e r e f o r e mention fewer e t h n i c backgrounds f o r t h e i r s p o u s e s ) , b u t t h a t they do know t h e i r p a r t n e r ' s main e t h n i c i t y ( t h e omitted e t h n i c i t i e s a s a group appear t o be minor o r secondary i d e n t i f i c a t i o n s ) . s i m i l a r f i n d i n g s s e e Smith, 1983). (For We s u s p e c t t h a t t h e lower l e v e l of e v e r working r e p o r t e d f o r spouses i s a l s o t h e r e s u l t of t h e proxy having l e s s complete information about t h e spouse. Respondents may n o t know o r n o t remember t h e i r spouse was employed e i t h e r f o r a s h o r t d u r a t i o n o r long ago ( p o s s i b l y even b e f o r e they met). Overall, it appears t h a t spouse r e p o r t s on b a s i c demographics produce d i s t r i b u t i o n s u n d i s t i n g u i s h a b l e from s e l f - r e p o r t s . 2 The d i f f e r e n c e s on l a b o r f o r c e s t a t u s do n o t . r e s u l t from t h e lower accuracy of proxy r e p o r t s , b u t r a t h e r from two forms of non-response b i a s . Only on e t h n i c i t y (and p o s s i b l y ever worked) a r e spouse r e p o r t s c l e a r l y i n f e r i o r , producing less complex r e p r e s e n t a t i o n s of e t h n i c d i v e r s i t y and probably undercounting t h e p r o p o r t i o n of people with a n c e s t o r s from t h e f i r s t immigrant wave. Y e t even i n t h i s s i t u a t i o n no d i f f e r e n c e appear on t h e main e t h n i c i t y of respondents and spouses. 2 ~ and d i t i o n a comparison of b i v a r a t e a s s o c i a t i o n s between respondent v a r i a b l e s and spousal v a r i a b l e s showed no s i g n i f i c a n t d i f f e r e n c e s , suggesting t h a t random e r r o r i s n o t g r e a t e r among spouse r e p o r t s than s e l f - r e p o r t s . REPORT BY WSBANDS AND WIVES OF JOINT AND BOUSELIOLD CONDITIONS Next, we examined how t h e r e p o r t s of husband and wives d i f f e r e d on e i t h e r j o i n t o r household v a r i a b l e s . In t h i s comparison we a r e n o t e v a l u a t i n g whether s e l f - r e p o r t s d i f f e r from proxy r e p o r t s , b u t whether r e p o r t s by husbands d i f f e r from r e p o r t s by wives on t h e same a t t r i b u t e . A s above, t h i s comparison i s n o t done on the micro l e v e l , s i n c e we d o n o t have s e p a r a t e r e p o r t s f o r t h e same c o u p l e s , b u t by a g g r e g a t e l e v e l comparison of t h e r e p o r t s of husbands and wives as a group. W e f i r s t examined whether i t e m non-response d i f f e r e d between husbands and wives. Only on one v a r i a b l e o u t of t h e 18 h o u s e h o l d / j o i n t v a r i a b l e s d i d t h e amount of m i s s i n g i n f o r m a t i o n ' d i f f e r s i g n i f i c a n t l y . Wives were less l i k e l y t o r e p o r t f a m i l y income t h a n husbands (91.7% vs. 94.7%). This d i f f e r e n c e r e s u l t s e n t i r e l y from h i g h e r d o n ' t knows among wives. This p r o b a b l y r e f l e c t s the lower l e v e l of female l a b o r f o r c e p a r t i c i p a t i o n and p e r h a p s a r e l u c t a n c e among a p o r t i o n o f male breadwinners t o d i s c u s s their e a r n i n g s with t h e i r wives. (Women who d i d not' g i v e income i n f o r m a t i o n a r e o l d e r , l e s s i n v o l v e d i n t h e l a b o r f o r c e , and more from t h e South t h a n women who gave f a m i l y income.) Looking a t t h e s u b s t a n t i v e r e s p o n s e t o t h e h o u s e h o l d / j o i n t v a r i a b l e s we f i n d s i g n i f i c a n t d i f f e r e n c e s on n i n e of 20 comparisons. r e p o r t s l i g h t l y l a r g e households t h a n husbands. Wives tend t o However s i n c e t h e a c t u a l i n f o r m a t i o n on household s i z e i s r e p o r t e d by a n i n f o r m a n t on t h e household enumeration form who may n o t be t h e r e s p o n d e n t , we can n o t c l e a r l y c r e d i t t h e s e d i f f e r e n c e s t o v a r i a n t r e p o r t i n g p a t t e r n s of husbands and wives. a l s o r e p o r t more e a r n e r s per household t h a n husbands (1.69 vs. 1.64). Wives W e s u s p e c t t h a t t h i s r e s u l t s from husbands being more l i k e l y t o f o r g e t p a r t - t i m e or d i s c o n t i n u e d employment by wives d u r i n g t h e p r e v i o u s year. Conversely men GSS: 62 r e p o r t more households having guns and h u n t e r s than wives do. Since hunting and gun ownership a r e h e a v i l y concentrated among men, w e b e l i e v e t h a t wives a r e probably f o r g e t t i n g some i n s t a n c e s ( % with hunter: husbands-35.2, 32.5; % results. with guns: husbands-57.2, wives-54.5). wives- On income we g e t mixed For a 12 c a t e g o r y income c l a s s i f i c a t i o n employed from 1973 t o 1985 and a 17 category c l a s s i f i c a t i o n used s i n c e 1982 we f i n d no n o t a b l e differences. But f o r a 16 c a t e g o r y s c a l e used from 1977 t o 1981 men r e p o r t s i g n i f i c a n t l y h i g h e r incomes than wives (mean c a t e g o r i e s : wives-10.84). husbands-11.25, Some two p a r t n e r i n t e r v i e w s t u d i e s have a l s o found a n e t tendency f o r wives t o r e p o r t lower incomes than husbands, s o w e b e l i e v e t h a t t h e r e i s probably a r e a l difference. One s t u d y (Haberman and Elinson, 1967) c r e d i t s such d i f f e r e n c e s t o housewives r e p o r t i n g take-home pay r a t h e r than g r o s s income and from wives underestimating t h e income of husbands working on commission. F i n a l l y , comparatively l a r g e d i f f e r e n c e s a r e observed on two of t h e t h r e e s u b j e c t i v e measures we included i n t h e a n a l y s i s . Wives a r e more l i k e l y t o r a t e t h e f a m i l i e s f i n a n c i a l s i t u a t i o n a s average (60.9% vs. 51.5%) and less l i k e l y t o c o n s i d e r t h e i r marriages a s very happy (64.1% vs. 67.2%). I n each of t h e s e c a s e s respondents g i v e t h e i r s u b j e c t i v e e v a l u a t i o n of a family f i n a n c i a l or marital matter. similar levels. Thus, we would n o t n e c e s s a r i l y e x p e c t t o f i n d While i n t h e aggregate t h e marriages and incomes being evaluated r e p r e s e n t t h e same universe, t h e s u b j e c t i v e e v a l u a t i o n s of t h e c o n d i t i o n do n o t have t o match. ( S i m i l a r l y s u b j e c t i v e q u e s t i o n s about s e x u a l i n t e r c o u r s e tend t o show more disagreement than o b j e c t i v e f a c t s about i n t e r c o u r s e , although t h e s e t o o seem t o d i v e r g e because of s e l e c t i v e perception-Levinger, 1966 and Clark and Wallin, 1964). This f i n d i n g confirms previous i n d i c a t i o n s t h a t s p o u s a l r e p o r t s tend t o a g r e e more on hard q u e s t i o n s and vary more on s o f t i t e m s (Ballweg, 1969 and Scanzo, 1965). GSS: 6 2 No d i f f e r e n c e s a r e found on s e v e r a l of the age c a t e g o r i e s of household composition, home ownership, presence of telephone, r a c i a l composition of 3 neighborhood, o r s a t i s f a c t i o n w i t h family income. C(HJCLus1m O v e r a l l proxy r e p o r t s f o r spouses were a s a c c u r a t e a s s e l f - r e p o r t s . S i g n i f i c a n t l y higher l e v e l s of i t e m non-response were found f o r proxy r e p o r t s , b u t t h e l e v e l of missing d a t a was n e v e r t h e l e s s n e g l i g i b l e . Proxy r e p o r t s were probably s u f f i c i e n t because t h e a t t r i b u t e s measured ( r e l i g i o n , education, occupation, e t c . ) were major, b a s i c demographics. On t h e one a t t r i b u t e ( e t h n i c i t y ) t h a t involved complex and less s a l i e n t information, proxy r e p o r t s proved t o be l e s s complete. S i m i l a r l y , r e p o r t s of husbands and wives tended t o diverge i n two circumstances. On household a t t r i b u t e s t h a t t h e husband was probably more knowledgable about and o r more i n t e r e s t e d i n (guns, hunting, and family income) r e p o r t s . d i f f e r e d s i g n i f i c a n t l y (although i n each c a s e t h e d i s c r e p a n c i e s were n o t l a r g e ) . And on s u b j e c t i v e e v a l u a t i o n s d i f f e r e n c e s appeared. When d e a l i n g w i t h major, concrete a t t r i b u t e s , proxy r e p o r t s a r e t h e p r e f e r a b l e method of d a t a c o l l e c t i o n because they a r e a s a c c u r a t e and l e s s costly. But when proxy r e p o r t s a r e extended i n t o complex and d e t a i l e d a r e a s about which t h e spouse has e i t h e r s u p e r i o r knowledge o r an unique p e r s p e c t i v e , proxy r e p o r t s a r e less a c c u r a t e ' t h a n s e l f - r e p o r t s . 3 ~ d d i t i o n a l l y , a comparison of nine b i v a r i a t e a s s o c i a t i o n s showed no notable d i f f e r e n c e between husbands and wives. GSS :62 Table 1 A Comparison o f Item Nonresponse from S e l f and Spouse Reports a Missing Labor Force S t a t u s Self Spouse Time o f Day Worked Self Spouse Days Worked Self spouse T o t a l Hours Worked Self . spouse Occupation Self Spouse Industry Self Spouse Ever Worked Self Spouse Years of Schooling Self Spouse H i g h e s t Degree Earned Self Spouse Current Religion Self Spouse P r o t e s t a n t Denonmination ( C u r r e n t ) Self 0.5 Spouse 0.9 Religon Raised Self spouse P r o t e s t a n t Denomination ( R a i s e d ) Self Spouse 0 7 1.3 Probability GSS: 6 2 -1 G- Table 2 A Comparison of Response D i s t r i b u t i o n s from S e l f and Spouse Reports Variables X2 Probability Labor Force S t a t u s Self Spouse Time of Day Worked Self Spouse Days Worked Self Spouse T o t a l Hours Worked Self Spouse Occupation Self spouse Prestige Self Spouse Industry Self Spouse Ever Worked Self Spouse Years of Schooling Self Spouse Highest Degree Earned Self Spouse Current Religion Self Spouse P r o t e s t a n t Denonmination ( C u r r e n t ) Self Spouse Religon Raised Self Spouse P r o t e s t a n t Denomination (Raised) Self Spouse #Mentions of E t h n i c i t y ( 0- 3 Self Spouse Means T-Tes t P r o b a b i l i t y GSS :62 Table 2 ( c o n t i n u e d ) A Comparison of Response D i s t r i b u t i o n s from S e l f and Spouse Reports Variables E t h n i c i t y (Country) Self Spouse S = Significant NS = Not S i g n i f i c a n t x2 Probability Means T-Tes t P r o b a b i l i t y Table 3 A Comparison of Reports on Household and J o i n t Variables by Husbands and Wives Variables Probability Household s i z e # under 6 # 6 t o 12 # 13 t o 17 # Adults # of Earners .006 Income (12 Categories, 1973-1985) .1 55 Income (16 Categories, 1977-1981) e033 Income ( 1 7 Categories, 1982-1985) i080 Homeowner s h i p Phone i n home Gun Ownership Union member (R o r Spouse) Hunter (R o r Spouse) Blacks l i v e i n neighborhood Blacks l i v i n g c l o s e How c l o s e a r e Blacks M a r i t a l Happiness S a t i s f a c t i o n with family income Fami l y r e l a t i v e income rank GSS: 62 References - Andersen, Ronald; Kasper, J u d i t h ; F r a n k e l , Martin R.; and A s s o c i a t e s , T o t a l Survey E r r o r : A p p l i c a t i o n s t o Improve Health Surveys. 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