Task 2: Comparison and Classification (6 marks): rformance of a record linkage project. (e) Provide the numerical linkage evaluation results for other (not optimal, see below) parameter settings that you have used (you only have to provide the output file for your best obtained linkage results - see next task)

(a) How do different comparison techniques affect linkage results? Discuss and justify how you selected appropriate com- parison functions for different attributes, and why these selected functions are suitable while others are not. (b) How do different classification techniques using different parameter settings affect linkage quality? Discuss and justify how you selected an appropriate classification technique and corresponding parameter settings to obtain high linkage quality and why other classification techniques are not or less suitable. (c) As discussed in the lectures in week 8, for suitable linkage quality measures, describe how the final record linkage quality changes with the choice of different parameters and techniques? Is the record linkage quality particularly sensitive to certain parameters, or choice of comparison or classification techniques? If so, why is this the case? (d) Are there any evaluation measures that are not useful? Describe why these measures are not useful in evaluating the performance of a record linkage project.