Abstract
This paper introduces a novel approach to evaluate performance in the executive functioning skills of bilingual and monolingual children. This approach targets method- and analysis-specific issues in the field, which has reached an impasse (Antoniou et al., 2021). This study moves beyond the traditional approach towards bilingualism by using an array of executive functioning tasks and frontier methodologies, which allow us to jointly consider multiple tasks and metrics in a new measure; technical efficiency (TE). We use a data envelopment analysis technique to estimate TE for a sample of 32 Greek–English bilingual and 38 Greek monolingual children. In a second stage, we compare the TE of the groups using an ANCOVA, a bootstrap regression, and a k-means nearest-neighbour technique, while controlling for a range of background variables. Results show that bilinguals have superior TE compared to their monolingual counterparts, being around 6.5% more efficient. Robustness tests reveal that TE yields similar results to the more complex conventional MANCOVA analyses, while utilising information in a more efficient way. By using the TE approach on a relevant existing dataset, we further highlight TE’s advantages compared to conventional analyses; not only does TE use a single measure, instead of two principal components, but it also allows more group observations as it accounts for differences between the groups by construction.
Highlights
A large strand of the empirical research on bilingualism focuses on the comparative performance of bilingual and monolingual populations with regards to executive function.1 On the one hand, a number of studies suggest that bilinguals outperform monolinguals on executive function tasks, in a so-called “bilingual advantage” (Bialystok, 2001; Bialystok et al, 2004, 2006; Bialystok & Martin, 2004; Calvo & Bialystok, 2014; Emmorey et al, 2008)
We aim to address both method-specific and analysis-specific issues, by presenting a novel approach that relies on the frontier methodology that measures the relative efficiency of a decision-making unit (DMU) compared to the best practice, in what is termed as technical efficiency
Our method relies on the frontier methodology that measures the relative efficiency of a decision-making unit (DMU) compared to the best practice, in what is termed as technical efficiency
Summary
A large strand of the empirical research on bilingualism focuses on the comparative performance of bilingual and monolingual populations with regards to executive function. On the one hand, a number of studies suggest that bilinguals outperform monolinguals on executive function tasks, in a so-called “bilingual advantage” (Bialystok, 2001; Bialystok et al, 2004, 2006; Bialystok & Martin, 2004; Calvo & Bialystok, 2014; Emmorey et al, 2008). The bilingual advantage may be confined within particular age ranges, such as preschool children or older adults (Bialystok, 2017; Hilchey & Klein, 2011), or specific subcategories of executive function; prohibiting generalisations (Bialystok et al, 2009). This lack of consensus in the literature may be attributed to several factors, broadly grouped into two categories; methodspecific and analysis-specific. The need to control for an extensive array of indicators has been highlighted in Paap and Greenberg (2013) within this context, and within Stuart (2010) in a broader sense.
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