| cognitive {splmm} | R Documentation |
Kenya School Lunch Intervention Cognitive Dataset
Description
In the Kenya school lunch intervention, children were given one of four school lunch interventions: meat, milk, calorie, or control. The first three groups were fed a school lunch of a stew called githeri supplemented with either meat, milk, or oil to create a lunch with a given caloric level, while the control group did not receive a lunch. Three schools were randomized to each group and the lunch program is the same for all children within a school. The data is available in modeling-longitudinal-data-rob-weiss and is broken up into sub data sets from four domains: Anthropometry, Cognitive, Morbidity, and Nutrition. We will be using the cognitive dataset for analyzing how the cognition level of the school children change over time and how the change is associated with other variables. The main cognitive measures is Raven's colored progressive matrices (Raven's), a measure of cognitive ability. There are three additional response variables: arithmetic score (arithmetic), verbal meaning (vmeaning), and total digit span score (dstotal) where digit span is a test of memory while others are considered measures of intelligence or education. The cognitive measurement baseline was taken prior to the lunch program onset and measurements were assessed at up to five times, called rounds, for each subject. More information about this dataset please see the reference:
Robert E Weiss.Modeling longitudinal data. Springer Science & Business Media, 2005.
Usage
data(cognitive)Format
A data frame of 1562 observations and 26 variables.
- id
Grouping variable. Unique ID for each subject.
- schoolid
School id 1-12.
- treatment
Calorie, meat, milk, control
- rn
round.
- year
Time in years from baseline.
- revans
Raven's colored matrices score.
- arithmetic
Arithmetic score.
- vmeaning
Verbal meaning.
- dstotal
Total digit span score.
- sex
Girl or Boy.
- age_at_time0
age at baseline.
- height
height at baseline.
- weight
weight at baseline.
- head_circ
Head circumference at baseline.
- ses
Socio-Economic Status score.
- mom_read
Mother's reading test.
- mom_write
Mother's writing test.
- mom_edu
Mother's years of educations.
- morbscore
Morbidity score: none/mild/severe.
- complete
Logical variable specifying whether the subject has all five rounds. 1-Yes, 0-No.
- rnone
Logical variable specifying whether the observation is the baseline. 1-round one (baseline), 0-not round one.
- relmonth
Time in months from baseline.
Examples
data(cognitive)