Educational Research - the Ethics and Aesthetics of Statistics
Educational Research - the Ethics and Aesthetics of Statistics
Educational Research - the Ethics and Aesthetics of Statistics
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7 To Frame <strong>the</strong> Unframable: Quantifying Irregular Migrants’ Presence 109<br />
Appendix 1: Methods for Stock Estimates<br />
Approach Data sources Method Estimation technique Main idea <strong>of</strong> calculation<br />
Direct<br />
approaches<br />
Based on immigration<br />
enforcement data<br />
Based on administrative<br />
statistics<br />
Multiplier methods Simple Multiplier Estimation <strong>of</strong> total with a simple multiplier<br />
based on derived or estimated ratio <strong>of</strong> ‘dark<br />
field’ vs. ‘clear field’<br />
Methods <strong>of</strong><br />
self-identification<br />
Capture-recapture/ Repeated<br />
capture<br />
Estimation based on probabilistic function<br />
derived from multiple recaptures <strong>of</strong><br />
individuals in sample<br />
Matching <strong>of</strong> registers Estimation based on implied non-registration in<br />
two or more individually matched registers<br />
R<strong>and</strong>om effect mixed<br />
modelling approach<br />
Evidence based on<br />
regularisation data<br />
Using data on status<br />
adjustments over time<br />
Estimation using statistical regression model<br />
assuming comparable apprehension rates <strong>of</strong><br />
legal/illegal residents with statistical<br />
adjustment for r<strong>and</strong>om effects<br />
Inferences on <strong>the</strong> size <strong>and</strong> composition <strong>of</strong><br />
irregular migrant stock prior to regularisation<br />
from data on applications for <strong>and</strong> grants <strong>of</strong><br />
regularisations<br />
Inferences derived from data on changes in<br />
residence status after a period <strong>of</strong> irregular<br />
residence<br />
Based on surveys Survey methods Direct survey methods Reconstruction <strong>of</strong> a "r<strong>and</strong>om sample" <strong>of</strong><br />
regular <strong>and</strong> irregular migrants through a<br />
re-weighting <strong>of</strong> <strong>the</strong> probability <strong>of</strong> contacts<br />
Snowball sampling methods Estimation using chain referral methods to<br />
obtain a sample <strong>of</strong> persons not registered vs.<br />
persons registered