;% ;% !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! ;% ;% Identification code deleted. ;% ;% As used by Kilpatrick, D. & Cameron-Jones, M. (1998). Numeric prediction ;% using instance-based learning with encoding length selection. In Progress ;% in Connectionist-Based Information Systems. Singapore: Springer-Verlag. ;% ;% !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! ;% ;% NAME: LOW BIRTH WEIGHT DATA ;% KEYWORDS: Logistic Regression ;% SIZE: 189 observations, 11 variables ;% ;% NOTE: ;% These data come from Appendix 1 of Hosmer and Lemeshow (1989). ;% These data are copyrighted and must be acknowledged and used accordingly. ;% ;% DESCRIPTIVE ABSTRACT: ;% The goal of this study was to identify risk factors associated with ;% giving birth to a low birth weight baby (weighing less than 2500 grams). ;% Data were collected on 189 women, 59 of which had low birth weight babies ;% and 130 of which had normal birth weight babies. Four variables which were ;% thought to be of importance were age, weight of the subject at her last ;% menstrual period, race, and the number of physician visits during the first ;% trimester of pregnancy. ;% ;% ;% SOURCE: ;% Data were collected at Baystate Medical Center, Springfield, ;% Massachusetts, during 1986. ;% ;% ;% NOTE: ;% This data set consists of the complete data. A paired data set ;% created from this low birth weight data may be found in plowbwt.dat and ;% a 3 to 1 matched data set created from the low birth weight data may be ;% found in mlowbwt.dat. ;% ;% ;% ;% Table: Code Sheet for the Variables in the Low Birth Weight Data Set. ;% ;% Columns Variable Abbreviation ;% ----------------------------------------------------------------------------- ;% 2-4 Identification Code ID ;% ;% 10 Low Birth Weight (0 = Birth Weight ge 2500g, LOW ;% l = Birth Weight < 2500g) ;% ;% 17-18 Age of the Mother in Years AGE ;% ;% 23-25 Weight in Pounds at the Last Menstrual Period LWT ;% ;% 32 Race (1 = White, 2 = Black, 3 = Other) RACE ;% ;% 40 Smoking Status During Pregnancy (1 = Yes, 0 = No) SMOKE ;% ;% 48 History of Premature Labor (0 = None, 1 = One, etc.) PTL ;% ;% 55 History of Hypertension (1 = Yes, 0 = No) HT ;% ;% 61 Presence of Uterine Irritability (1 = Yes, 0 = No) UI ;% ;% 67 Number of Physician Visits During the First Trimester FTV ;% (0 = None, 1 = One, 2 = Two, etc.) ;% ;% 73-76 Birth Weight in Grams BWT ;% ----------------------------------------------------------------------------- ;% ;% PEDAGOGICAL NOTES: ;% These data have been used as an example of fitting a multiple ;% logistic regression model. ;% ;% STORY BEHIND THE DATA: ;% Low birth weight is an outcome that has been of concern to physicians ;% for years. This is due to the fact that infant mortality rates and birth ;% defect rates are very high for low birth weight babies. A woman's behavior ;% during pregnancy (including diet, smoking habits, and receiving prenatal care) ;% can greatly alter the chances of carrying the baby to term and, consequently, ;% of delivering a baby of normal birth weight. ;% The variables identified in the code sheet given in the table have been ;% shown to be associated with low birth weight in the obstetrical literature. The ;% goal of the current study was to ascertain if these variables were important ;% in the population being served by the medical center where the data were ;% collected. ;% ;% ;% References: ;% ;% 1. Hosmer and Lemeshow, Applied Logistic Regression, Wiley, (1989). ;% (defun lowbwt () (data :name 'lowbwt :columns '(LOW $AGE $LWT RACE SMOKE PTL HT UI FTV $class) :egs '( (0 19 182 2 0 0 0 1 0 2523) (0 33 155 3 0 0 0 0 3 2551) (0 20 105 1 1 0 0 0 1 2557) (0 21 108 1 1 0 0 1 2 2594) (0 18 107 1 1 0 0 1 0 2600) (0 21 124 3 0 0 0 0 0 2622) (0 22 118 1 0 0 0 0 1 2637) (0 17 103 3 0 0 0 0 1 2637) (0 29 123 1 1 0 0 0 1 2663) (0 26 113 1 1 0 0 0 0 2665) (0 19 95 3 0 0 0 0 0 2722) (0 19 150 3 0 0 0 0 1 2733) (0 22 95 3 0 0 1 0 0 2750) (0 30 107 3 0 1 0 1 2 2750) (0 18 100 1 1 0 0 0 0 2769) (0 18 100 1 1 0 0 0 0 2769) (0 15 98 2 0 0 0 0 0 2778) (0 25 118 1 1 0 0 0 3 2782) (0 20 120 3 0 0 0 1 0 2807) (0 28 120 1 1 0 0 0 1 2821) (0 32 121 3 0 0 0 0 2 2835) (0 31 100 1 0 0 0 1 3 2835) (0 36 202 1 0 0 0 0 1 2836) (0 28 120 3 0 0 0 0 0 2863) (0 25 120 3 0 0 0 1 2 2877) (0 28 167 1 0 0 0 0 0 2877) (0 17 122 1 1 0 0 0 0 2906) (0 29 150 1 0 0 0 0 2 2920) (0 26 168 2 1 0 0 0 0 2920) (0 17 113 2 0 0 0 0 1 2920) (0 17 113 2 0 0 0 0 1 2920) (0 24 90 1 1 1 0 0 1 2948) (0 35 121 2 1 1 0 0 1 2948) (0 25 155 1 0 0 0 0 1 2977) (0 25 125 2 0 0 0 0 0 2977) (0 29 140 1 1 0 0 0 2 2977) (0 19 138 1 1 0 0 0 2 2977) (0 27 124 1 1 0 0 0 0 2992) (0 31 215 1 1 0 0 0 2 3005) (0 33 109 1 1 0 0 0 1 3033) (0 21 185 2 1 0 0 0 2 3042) (0 19 189 1 0 0 0 0 2 3062) (0 23 130 2 0 0 0 0 1 3062) (0 21 160 1 0 0 0 0 0 3062) (0 18 90 1 1 0 0 1 0 3076) (0 18 90 1 1 0 0 1 0 3076) (0 32 132 1 0 0 0 0 4 3080) (0 19 132 3 0 0 0 0 0 3090) (0 24 115 1 0 0 0 0 2 3090) (0 22 85 3 1 0 0 0 0 3090) (0 22 120 1 0 0 1 0 1 3100) (0 23 128 3 0 0 0 0 0 3104) (0 22 130 1 1 0 0 0 0 3132) (0 30 95 1 1 0 0 0 2 3147) (0 19 115 3 0 0 0 0 0 3175) (0 16 110 3 0 0 0 0 0 3175) (0 21 110 3 1 0 0 1 0 3203) (0 30 153 3 0 0 0 0 0 3203) (0 20 103 3 0 0 0 0 0 3203) (0 17 119 3 0 0 0 0 0 3225) (0 17 119 3 0 0 0 0 0 3225) (0 23 119 3 0 0 0 0 2 3232) (0 24 110 3 0 0 0 0 0 3232) (0 28 140 1 0 0 0 0 0 3234) (0 26 133 3 1 2 0 0 0 3260) (0 20 169 3 0 1 0 1 1 3274) (0 24 115 3 0 0 0 0 2 3274) (0 28 250 3 1 0 0 0 6 3303) (0 20 141 1 0 2 0 1 1 3317) (0 22 158 2 0 1 0 0 2 3317) (0 22 112 1 1 2 0 0 0 3317) (0 31 150 3 1 0 0 0 2 3321) (0 23 115 3 1 0 0 0 1 3331) (0 16 112 2 0 0 0 0 0 3374) (0 16 135 1 1 0 0 0 0 3374) (0 18 229 2 0 0 0 0 0 3402) (0 25 140 1 0 0 0 0 1 3416) (0 32 134 1 1 1 0 0 4 3430) (0 20 121 2 1 0 0 0 0 3444) (0 23 190 1 0 0 0 0 0 3459) (0 22 131 1 0 0 0 0 1 3460) (0 32 170 1 0 0 0 0 0 3473) (0 30 110 3 0 0 0 0 0 3475) (0 20 127 3 0 0 0 0 0 3487) (0 23 123 3 0 0 0 0 0 3544) (0 17 120 3 1 0 0 0 0 3572) (0 19 105 3 0 0 0 0 0 3572) (0 23 130 1 0 0 0 0 0 3586) (0 36 175 1 0 0 0 0 0 3600) (0 22 125 1 0 0 0 0 1 3614) (0 24 133 1 0 0 0 0 0 3614) (0 21 134 3 0 0 0 0 2 3629) (0 19 235 1 1 0 1 0 0 3629) (0 25 95 1 1 3 0 1 0 3637) (0 16 135 1 1 0 0 0 0 3643) (0 29 135 1 0 0 0 0 1 3651) (0 29 154 1 0 0 0 0 1 3651) (0 19 147 1 1 0 0 0 0 3651) (0 19 147 1 1 0 0 0 0 3651) (0 30 137 1 0 0 0 0 1 3699) (0 24 110 1 0 0 0 0 1 3728) (0 19 184 1 1 0 1 0 0 3756) (0 24 110 3 0 1 0 0 0 3770) (0 23 110 1 0 0 0 0 1 3770) (0 20 120 3 0 0 0 0 0 3770) (0 25 241 2 0 0 1 0 0 3790) (0 30 112 1 0 0 0 0 1 3799) (0 22 169 1 0 0 0 0 0 3827) (0 18 120 1 1 0 0 0 2 3856) (0 16 170 2 0 0 0 0 4 3860) (0 32 186 1 0 0 0 0 2 3860) (0 18 120 3 0 0 0 0 1 3884) (0 29 130 1 1 0 0 0 2 3884) (0 33 117 1 0 0 0 1 1 3912) (0 20 170 1 1 0 0 0 0 3940) (0 28 134 3 0 0 0 0 1 3941) (0 14 135 1 0 0 0 0 0 3941) (0 28 130 3 0 0 0 0 0 3969) (0 25 120 1 0 0 0 0 2 3983) (0 16 95 3 0 0 0 0 1 3997) (0 20 158 1 0 0 0 0 1 3997) (0 26 160 3 0 0 0 0 0 4054) (0 21 115 1 0 0 0 0 1 4054) (0 22 129 1 0 0 0 0 0 4111) (0 25 130 1 0 0 0 0 2 4153) (0 31 120 1 0 0 0 0 2 4167) (0 35 170 1 0 1 0 0 1 4174) (0 19 120 1 1 0 0 0 0 4238) (0 24 116 1 0 0 0 0 1 4593) (0 45 123 1 0 0 0 0 1 4990) (1 28 120 3 1 1 0 1 0 709) (1 29 130 1 0 0 0 1 2 1021) (1 34 187 2 1 0 1 0 0 1135) (1 25 105 3 0 1 1 0 0 1330) (1 25 85 3 0 0 0 1 0 1474) (1 27 150 3 0 0 0 0 0 1588) (1 23 97 3 0 0 0 1 1 1588) (1 24 128 2 0 1 0 0 1 1701) (1 24 132 3 0 0 1 0 0 1729) (1 21 165 1 1 0 1 0 1 1790) (1 32 105 1 1 0 0 0 0 1818) (1 19 91 1 1 2 0 1 0 1885) (1 25 115 3 0 0 0 0 0 1893) (1 16 130 3 0 0 0 0 1 1899) (1 25 92 1 1 0 0 0 0 1928) (1 20 150 1 1 0 0 0 2 1928) (1 21 200 2 0 0 0 1 2 1928) (1 24 155 1 1 1 0 0 0 1936) (1 21 103 3 0 0 0 0 0 1970) (1 20 125 3 0 0 0 1 0 2055) (1 25 89 3 0 2 0 0 1 2055) (1 19 102 1 0 0 0 0 2 2082) (1 19 112 1 1 0 0 1 0 2084) (1 26 117 1 1 1 0 0 0 2084) (1 24 138 1 0 0 0 0 0 2100) (1 17 130 3 1 1 0 1 0 2125) (1 20 120 2 1 0 0 0 3 2126) (1 22 130 1 1 1 0 1 1 2187) (1 27 130 2 0 0 0 1 0 2187) (1 20 80 3 1 0 0 1 0 2211) (1 17 110 1 1 0 0 0 0 2225) (1 25 105 3 0 1 0 0 1 2240) (1 20 109 3 0 0 0 0 0 2240) (1 18 148 3 0 0 0 0 0 2282) (1 18 110 2 1 1 0 0 0 2296) (1 20 121 1 1 1 0 1 0 2296) (1 21 100 3 0 1 0 0 4 2301) (1 26 96 3 0 0 0 0 0 2325) (1 31 102 1 1 1 0 0 1 2353) (1 15 110 1 0 0 0 0 0 2353) (1 23 187 2 1 0 0 0 1 2367) (1 20 122 2 1 0 0 0 0 2381) (1 24 105 2 1 0 0 0 0 2381) (1 15 115 3 0 0 0 1 0 2381) (1 23 120 3 0 0 0 0 0 2395) (1 30 142 1 1 1 0 0 0 2410) (1 22 130 1 1 0 0 0 1 2410) (1 17 120 1 1 0 0 0 3 2414) (1 23 110 1 1 1 0 0 0 2424) (1 17 120 2 0 0 0 0 2 2438) (1 26 154 3 0 1 1 0 1 2442) (1 20 105 3 0 0 0 0 3 2450) (1 26 190 1 1 0 0 0 0 2466) (1 14 101 3 1 1 0 0 0 2466) (1 28 95 1 1 0 0 0 2 2466) (1 14 100 3 0 0 0 0 2 2495) (1 23 94 3 1 0 0 0 0 2495) (1 17 142 2 0 0 1 0 0 2495) (1 21 130 1 1 0 1 0 3 2495) )))