Data on religion and politics in India
This table contains booth-level estimates of religious demography based on the connotations of electors' names in the electoral rolls of Gujarat (revision 2014, i.e. the one used for the 2014 Lok Sabha elections), using an optimized version of my name2community algorithm
|id||unique code for each row, in case one ever needs it|
|ac_id_09||ID code of the assembly segment assigned by the Election Commission (identical with all other post-delimitation codes, hence the _09)|
|booth_id_14||ID code of the polling booth assigned by the Election Commission (together with ac_id_09, this should suffice for matching with other tables)|
|electors_14||Number of registered electors|
|missing_percent_14||Percentage of electors whose names could not be matched by the algorithm (one crude aggregate measure of reliability)|
|hindu_percent_14||Estimated percentage of electors who are Hindu|
|muslim_percent_14||Estimated percentage of electors who are Muslim|
|christian_percent_14||Estimated percentage of electors who are Christian (be aware that accuracy of the algorithm has only been tested for Hindu and Muslim names, not Christian ones)|
|sikh_percent_14||Estimated percentage of electors who are Sikh (be aware that accuracy of the algorithm has only been tested for Hindu and Muslim names, not Sikh ones)|
|jain_percent_14||Estimated percentage of electors who are Jain (be aware that accuracy of the algorithm has only been tested for Hindu and Muslim names, not Jain ones)|
|buddhist_percent_14||Estimated percentage of electors who are Buddhist (be aware that accuracy of the algorithm has only been tested for Hindu and Muslim names, not Buddhist ones)|
|age_avg_14||Average age of all electors|
|age_stddev_14||Standard deviation of the age distribution of all electors|
|female_percent_14||Percentage of female electors among all electors|
|age_*_avg_14||Average age of electors estimated to be * (Hindu / Muslim / Christian / Sikh / Jain / Buddhist)|
|age_*_stddev_14||Standard deviation of the age distribution of electors estimated to be * (Hindu / Muslim / Christian / Sikh / Jain / Buddhist)|
|female_*_percent_14||Percentage of female electors among electors estimated to be * (Hindu / Muslim / Christian / Sikh / Jain / Buddhist)|
Originally, the electoral rolls were crawled in July 2014 from http://ceouttarpradesh.nic.in/_RollPDF.aspx using run-in-osc/downloadpdf.pl; the "last updated on" entry on the rolls' cover sheet reads "1/1/2014".
Raw data itself (electoral roll PDFs as well as the voter-by-voter name classifications derived from them) are not shared here, though, both to save space (it amounts to several GBs of binary dumps) and in light of privacy concerns (electoral rolls are public data, but I doubt that electors like to have their probable religion searchable by EPIC card number).
The subsequent processing chain is however preserved in the run-in-osc, run-in-osc-add-ngram, run-in-osc-add-ngram and run-in-arc-frontpage folders for reference. It ran on the Oxford Advanced Research Computing cluster and several hardcoded binary paths as well as the Torque scheduler commands are unique to this environment. After running createnamedb.pl once and putting all additional software in place, the chain was started using run.sh, which basically sparked 403 parallel processes (one for each assembly segment), in which roll PDFs were downloaded, relevant data extracted, names of electors matched to likely religion and ultimately booth-wise estimates of religious demography calculated. After the main processing chain, the run-in-osc-add-ngram chain attempted to further reduce missing_percent_14 using ngram technology (see scripts there for details). Finally there was a glitch with gender extraction; this was rectified using the run-in-osc-add-gender scripts. Finally run-in-arc-frontpage added frontpage details for the gujid table.
The major problem was something else, though: Because the PDFs were corrupted, one could not simply extract non-latin text from them as was the case in earlier years - it came out garbled. Tturns out the version of Crystal Reports used in 2014 resulted in wrong ToUnicode CMaps in the PDF - an unfixable problem. Ultimately, I thus settled on an OCR solution - see pdf2list.pl for the gory details (each electoral roll is dissected into tiny TIFFs, which are then fed through tesseract).
The final task of pulling everything together for this dataset is delivered by combine.pl, which results in one large booths.sqlite file, which is shared here as .tgz archive (even this is quite large). The SQL code to put this into the main database and create the subsequent CSV dumps was done using transform.pl.
While the database in its entirety is subject to an ODC Open Database License, as explained in the main README and LICENSE files, the content of this specific table as well as code used for crawling and compilation is subject to a CC-BY-NC-SA 4.0 license: you can use it for non-commercial purposes as long as you attribute and share any additions or modifications on equal terms.