Aggregating data frames¶
In the following we aggregate data from the British Election Study 2010. The data set bes2010feelings.RData is prepared from the original available at https://www.britishelectionstudy.com/data-object/2010-bes-cross-section/ by removing identifying information and scrambling the data.
load("bes2010feelings.RData")
Here we obtain the average affects towards the major three parties, using an ‘old-style’ call of the function aggregate()
.
Mean <- function(x,...)mean(x,...,na.rm=TRUE)
aggregate(bes2010feelings[c("flng.brown","flng.cameron",
"flng.clegg","flng.salmond")],
with(bes2010feelings,
list(Region=region,Wave=wave)),
Mean)
Region Wave flng.brown flng.cameron flng.clegg flng.salmond
1 England Pre 4.092674 5.284810 4.618690 NaN
2 Scotland Pre 5.395000 4.502591 4.405229 4.412371
3 Wales Pre 4.328244 4.774194 4.592233 NaN
4 England Post 4.140990 5.441454 5.160313 NaN
5 Scotland Post 5.510769 4.539075 4.513793 4.228707
6 Wales Post 4.307692 4.855895 4.814480 NaN
More recent versions of R also provide a slightly more convenient way of calling aggregate()
using a formula argument:
aggregate(cbind(flng.brown,
flng.cameron,
flng.clegg,
flng.salmond
)~region+wave,
data=bes2010feelings,
Mean)
region wave flng.brown flng.cameron flng.clegg flng.salmond
1 Scotland Pre 5.466667 4.500000 4.460000 4.480000
2 Scotland Post 5.513986 4.513986 4.498252 4.270979
The memisc package has a somewhat more flexible variant of aggregate()
, the function Aggregate()
. Here we reproduce the results of aggregate()
. You may need to install this package using install.packages("memisc")
from CRAN if you want to run this on your computer. (The package is already installed on the notebook container, however.)
library(memisc)
Loading required package: lattice
Loading required package: MASS
Attaching package: ‘memisc’
The following object is masked _by_ ‘.GlobalEnv’:
Mean
The following objects are masked from ‘package:stats’:
contr.sum, contr.treatment, contrasts
The following object is masked from ‘package:base’:
as.array
Aggregate(c(Brown=Mean(flng.brown),
Cameron=Mean(flng.cameron),
Clegg=Mean(flng.clegg),
Salmond=Mean(flng.salmond))~region+wave,
data=bes2010feelings)
region wave Brown Cameron Clegg Salmond
1 England Pre 4.092674 5.284810 4.618690 NaN
2 Scotland Pre 5.395000 4.502591 4.405229 4.412371
3 Wales Pre 4.328244 4.774194 4.592233 NaN
4 NA Pre 4.507143 4.929870 4.426573 4.760563
5 England Post 4.140990 5.441454 5.160313 NaN
6 Scotland Post 5.510769 4.539075 4.513793 4.228707
7 Wales Post 4.307692 4.855895 4.814480 NaN
8 NA Post NA NA NA NA
However it also allows to used different summary functions.
Var <- function(x,...) var(x,...,na.rm=TRUE)
Aggregate(c(Mean(flng.brown),Var(flng.brown))~region+wave,
data=bes2010feelings)
region wave Mean(flng.brown) Var(flng.brown)
1 England Pre 4.092674 7.287340
2 Scotland Pre 5.395000 8.210025
3 Wales Pre 4.328244 8.776042
4 NA Pre 4.507143 7.754125
5 England Post 4.140990 7.109491
6 Scotland Post 5.510769 6.376617
7 Wales Post 4.307692 7.647408
8 NA Post NA NA
Downloadable R script and interactive version
- R Script: aggregating.R
- Interactive version (shuts down after 60s):
- Interactive version (sign in required):
Explanation
The link with the “jupyterhub” icon directs you to an interactive Jupyter1 notebook, which runs inside a Docker container2. There are two variants of the interative notebook. One shuts down after 60 seconds and does not require a sign it. The other requires sign in using your ORCID3 credentials, yet shuts down only after 24 hours. (There is no guarantee that such a container persists that long, it may be shut down earlier for maintenance purposes.) After shutdown all data within the container will be reset, i.e. all files created by the user will be deleted.4
Above you see a rendered version of the Jupyter notebook.5
- 1
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For more information about Jupyter see
http://jupyter.org
. The Jupyter notebooks make use of the IRKernel package. - 2
-
For more information about Docker see
https://docs.docker.com/
. The container images were created with repo2docker, while containers are run with docker spawner. - 3
-
ORCID is a free service for the authentication of researchers. It also allows to showcase publications and contributions to the academic community such as peer review.. See
https://info.orcid.org/what-is-orcid/
for more information. - 4
-
The Jupyter notebooks come with NO WARRANTY whatsoever. They are provided for educational and illustrative purposes only. Do not use them for production work.
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The notebook is rendered with the help of the nbsphinx extension.