birth {exactmaxsel} | R Documentation |
A data set containing 25 qualitative and quantitative variables for n=501 births in 2003 and 2004.
data(birth)
The missing values are of two types:
1. Some of the variables do not concern all the births. For example, the variable
Episiotomy
is not relevant for cesarean births. The type NA
is
used for these entries. Such observations should be removed when analysing
these variables. It does not make sense to imput these missing values.
2. Some questionnaires were returned incomplete, because the mother forgot
some questions or did not know the answer (especially for the head circumference).
A data frame with following variables
IndexMother |
Index of the mother (unordered) |
Sex |
Sex of the baby (1:male,2:female) |
Weight |
Weight of the baby in g. |
Height |
Height of the baby in cm. |
Head |
Head circumference of the baby in cm. |
Month |
Month of birth (coded as 1:january,...,12:december). |
Year |
Year of birth. |
Country |
Country of birth (FR:France,BE:Belgium,CH:Switzerland,CA:Canada, etc). |
Term |
Duration of the pregnancy in week. |
AgeMother |
Age of the mother in year. |
Previous |
Number of previous deliveries. |
WeightBefore |
Weight of the mother before pregnancy in kg. |
HeightMother |
Height of the mother in cm. |
WeightEnd |
Weight of the mother at the end of the pregnancy. |
Twins |
Twin pregnancy? (0:no,1:yes) |
Intensive |
Number of days spent by the baby in the neonatology intensive care unit. |
Cesarean |
Cesarean birth? (0:no,1:yes) |
Planned |
If cesarean birth, was the cesarean planned before the beginning of labor? (0:no,1:yes) |
Episiotomy |
If vaginal birth, did the mother have an episiotomy? (0:no,1:yes) |
Tear |
If vaginal birth, did the mother tear? (0:no,1:yes) |
Operative |
If vaginal birth, was it a vaginal operative birth (i.e. with forceps,vacuum extractor,etc)? (0:no,1:yes) |
Induced |
If vaginal delivery or emergency cesarean, was the labor induced medically? (0:no,1:yes) |
Membranes |
Did the membranes rupture before the beginning of labor? (0:no,1:yes) |
Rest |
Was the mother prescribed bed rest for one month or more? (0:no,1:yes) |
Presentation |
Presentation of the baby at birth (1:cephalic,2:breech,3:other,e.g. transverse). |
This data set was collected from internet users via french-speaking pregnancy forums in August 2004 by Anne-Laure Boulesteix.
A.-L. Boulesteix (2006), Maximally selected chi-square statistics for ordinal variables, Biometrical Journal 48:451-462.
# load exactmaxsel library library(exactmaxsel) # load data set data(birth) # Display the two first observations birth[1:2,]