以2009和2013年立法會當選議員組別性質為視角，利用各組別在不同區域獲得的有效票數，計算標準化發生比（ Standardized Incidence Ratio（SIR）），藉以分析當選組別的得票分佈是否具有區域性差異，了解不同社經背景選民在投票取向上與候選組別之間的關係，發現各候選組別政綱相近的情形下，選民的投票取向與候選組別的背景因素並無太大關聯。

From the perspective of group affiliation of elected Legislative Assembly deputies (2009 and 2013), this paper adopts the number of valid returns in various geographical areas in order to calculate the Standardised Incidence Ratio (SIR) for individual candidate groups. It is aimed to investigate the difference in regional distribution of votes gained by groups with distinct affiliation, so as to manifest the possible relationship between the socio-economic backgrounds of voters and candidate group affiliation. The paper finds that in the circumstance of little divergence among political platforms of the competing groups, it is less likely that group affiliation casts very strong effect on voting behaviour.