Title: V9.2 SAS System Output
Author: SAS Version 9.2

Linear Regression Results for Dependent Variable (bwt)

The REG Procedure
Model: Linear
Dependent Variable: bwt birth weight (g)

Average of Squared Studentized Residual within Each 10-Percentile Predicted Outcome (bwt)

The MEANS Procedure

Observation with the largest Cooks Distance.

Observation with the largest Leverage.

Demographic Characteristics

The FREQ Procedure

Demographic Characteristics

The MEANS Procedure

Demographic Characteristics

The REG Procedure
Model: Linear
Dependent Variable: bwt birth weight (g)

Linear Regression Results for Dependent Variable (bwt)

Analysis Variable : _residsqr (Squared Studentized Residual)
Range_of_Percentile | N Obs | N | Mean | Std Dev | Minimum | Maximum
0-10th percentile | 18 | 18 | 1.4274752 | 1.5424108 | 0.0080935 | 4.8631413
10-20th percentile | 20 | 20 | 0.4707818 | 0.6250137 | 0.0018279 | 2.1490880
20-30th percentile | 19 | 19 | 1.4654382 | 1.9840568 | 0.0014726 | 8.4038896
30-40th percentile | 18 | 18 | 0.8597801 | 1.1438599 | 0.0032374 | 3.4654545
40-50th percentile | 20 | 20 | 0.7965907 | 0.7533036 | 0.0625001 | 2.8003781
50-60th percentile | 18 | 18 | 0.8284207 | 0.9907777 | 3.0592951E-6 | 3.6711840
60-70th percentile | 21 | 21 | 0.7359894 | 0.9177190 | 0.0011539 | 3.3907482
70-80th percentile | 17 | 17 | 2.1042813 | 2.1595641 | 0.0211613 | 7.9466246
80-90th percentile | 20 | 20 | 0.8320928 | 0.9965283 | 0.0030813 | 3.8871685
90-100th percentile | 18 | 18 | 0.7080947 | 1.0156711 | 0.000676424 | 4.2975421

Categorized birth weight | Age of mother | Weight at last menstrual period | Race (3 categories) | Smoking status during pregnancy | History of hypertension | Uterine irritability | # of physician visits first trimestor | History of premature labor
>= 2500 g | 45 | 123 | white | NonSmoker | No | No | 1 | No

birth weight (g) | smoke NonSmoker | race other | race white | ht Yes | ui No | Predicted Value of bwt | Residual | Studentized Residual | Cook's D Influence Statistic | Leverage
4990 | 1 | 0 | 1 | 0 | 1 | 3265.11 | 1724.89 | 2.81898 | 0.11697 | 0.10535

Categorized birth weight | Age of mother | Weight at last menstrual period | Race (3 categories) | Smoking status during pregnancy | History of hypertension | Uterine irritability | # of physician visits first trimestor | History of premature labor
>= 2500 g | 28 | 250 | other | Smoker | No | No | 1 | No

birth weight (g) | smoke NonSmoker | race other | race white | ht Yes | ui No | Predicted Value of bwt | Residual | Studentized Residual | Cook's D Influence Statistic | Leverage
3303 | 0 | 1 | 0 | 0 | 1 | 3189.44 | 113.563 | 0.19151 | .000871445 | 0.15973

Smoking status during pregnancy

smoke

Frequency

Percent

Cumulative
Frequency

Cumulative
Percent

NonSmoker | 115 | 60.85 | 115 | 60.85
Smoker | 74 | 39.15 | 189 | 100.00

Race (3 categories)

race

Frequency

Percent

Cumulative
Frequency

Cumulative
Percent

black | 26 | 13.76 | 26 | 13.76
other | 67 | 35.45 | 93 | 49.21
white | 96 | 50.79 | 189 | 100.00

History of hypertension

ht

Frequency

Percent

Cumulative
Frequency

Cumulative
Percent

No | 177 | 93.65 | 177 | 93.65
Yes | 12 | 6.35 | 189 | 100.00

Uterine irritability

ui

Frequency

Percent

Cumulative
Frequency

Cumulative
Percent

No | 161 | 85.19 | 161 | 85.19
Yes | 28 | 14.81 | 189 | 100.00

Variable | Label | N | Mean | Std Dev | Minimum | Maximum

age
lwt

Age of mother
Weight at last menstrual period

189
189

23.2380952
129.6878307

5.2986779
30.6471496

14.0000000
80.0000000

45.0000000
250.0000000

Number of Observations Read | 189
Number of Observations Used | 189

Variable | Values | Parameter Estimate | Standard Error | P-Value | Lower 95% CI | Upper 95% CI | VIF | Type 3 P-Value
INTERCEPT | | 1550.14836 | 321.33774 | <.0001 | 916.09855 | 2184.19818 | 0 | .
AGE | | -4.61616 | 9.31942 | 0.6210 | -23.00484 | 13.77253 | 1.09542 | .
HT | Yes | -591.54917 | 200.20696 | 0.0035 | -986.58894 | -196.50939 | 1.07637 | .
HT | No | . | . | . | . | . | . | .
LWT | | 4.42562 | 1.70029 | 0.0100 | 1.07067 | 7.78056 | 1.21983 | .
RACE | other | 134.27309 | 158.47330 | 0.3980 | -178.41963 | 446.96581 | 2.59536 | .
RACE | white | 490.96743 | 149.01809 | 0.0012 | 196.93134 | 785.00352 | 2.50658 | .
RACE | black | . | . | . | . | . | . | .000480057
SMOKE | NonSmoker | 359.50523 | 103.95415 | 0.0007 | 154.38736 | 564.62310 | 1.16269 | .
SMOKE | Smoker | . | . | . | . | . | . | .
UI | No | 527.86441 | 134.98454 | 0.0001 | 261.51872 | 794.21011 | 1.03849 | .
UI | Yes | . | . | . | . | . | . | .

CTSIBERD\BERDmacros\Chen\Linear reg