A review of conceptual approaches and empirical evidence on probability and nonprobability sample survey research

There is an ongoing debate in the survey research literature about whether and when probability and nonprobability sample surveys produce accurate estimates of a larger population. Statistical theory provides a justification for confidence in probability sampling as a function of the survey design, whereas inferences based on nonprobability sampling are entirely dependent on models for validity. This article reviews the current debate about probability and nonprobability sample surveys. We describe the conditions under which nonprobability sample surveys may provide accurate results in theory and discuss empirical evidence on which types of samples produce the highest accuracy in practice. From these theoretical and empirical considerations, we derive best-practice recommendations and outline paths for future research

The influence of situational cues on children’s creativity in an alternative Uses task and the moderating effect of selective attention

Taking a perception-action perspective, we investigated how the presence of different real objects in children’s immediate situation affected their creativity and whether this effect was moderated by their selective attention. Seventy children between ages 9 and 12 years old participated. Verbal responses on a visual Alternative Uses Task with a low stimulus and high stimulus condition were coded on fluency, flexibility, and originality. Selective attention was measured with a visual search task. Results showed that fluency was not affected by stimulus condition and was unrelated to selective attention. Flexibility was positively associated with selective attention. Originality, net of fluency and flexibility, showed a main effect of stimulus condition in an unexpected direction, as children gave more original responses in the low stimulus condition compared to the high stimulus condition. A significant moderation effect revealed that children with better selective attention skills benefitted from a low stimulus environment, whereas children with weaker selective attention performed better in a high stimulus environment. The findings demonstrate differential effects of the immediate situation and selective attention, and support the hypothesis that creativity is impacted by immediate situation and selective attention, yet in unexpected ways

A code-switching asymmetry in bilingual children: code-switching from Dutch to Frisian requires more cognitive control than code-switching from Frisian to Dutch

Recent research suggests that cognitive control plays a role in code-switching, both in bilingual adults and in bilingual children. Code-switching would only require cognitive control, however, when speakers maintain some degree of separation between their two languages, not when they completely mix the lexicons and grammars of their languages. For Frisian–Dutch bilinguals, mixing of Dutch (majority language) into Frisian (minority language) is common, but mixing of Frisian into Dutch is not. Therefore, Frisian–Dutch bilinguals need to maintain some degree of language separation when they speak Dutch, but not when they speak Frisian, predicting that code-switching from Dutch to Frisian would affect cognitive control more than vice versa

Examining the Role of Parents and Teachers in Executive Function Development in Early and Middle Childhood: A Systematic Review

The aim of the current systematic review is (1) to examine theoretical frameworks and mechanisms explaining the association between parental and teacher behaviors and child executive function (EF) development, and (2) to compare and combine empirical findings for the relationship between parental and teacher behaviors and child EF development in early and middle childhood. Results revealed that theoretical frameworks have been established more strongly in the parent literature and parental behaviors have been more extensively studied with more diverse terms compared to studies in teacher literature. Overall, patterns of findings suggest that positive (e.g., emotional support) and cognitive parental/teacher behaviors (e.g., cognitive stimulation) were positively linked to child EF performance while negative behaviors (e.g., intrusiveness) were adversely related. Considering the similar roles of parents and teachers in child EF development, insights from parent literature could enable a better understanding of the impact of teacher behaviors on child EF (and vice versa), and opens new venues for future teacher research. Moreover, these findings suggest that, in addition to genetic transmission, social factors such as parent/teacher-child interactions play a significant role in EF development. Future research should investigate the joint influence of parent and teacher behaviors on child EF

Profiles of Bilingualism in Early Childhood: A Person-centred Latent Profile Transition Approach

Bilingualism as it occurs in current societies is a complex, multidimensional and dynamic phenomenon, calling for new approaches to capture this concept. This study shows the feasibility of a person-centred approach by combining measures of the use of and proficiency in the first and second language from 110 young Turkish–Dutch children at two measurement waves, using two existing datasets. Latent Profile Analysis revealed four profiles, equivalent at age four and six: 1) Dominant L1 use, relatively low L1 and L2 proficiency, 2) Dual L1 and L2 use, around average L1 and L2 proficiency, 3) Dominant L1 use, relatively high L1 and L2 proficiency and 4) Dominant L2 use, relatively high L2 proficiency. Latent Transition Analysis indicated that children changed in profiles over time. Regression analyses showed that profiles were differently related to the family's socioeconomic status and children's nonverbal intelligence at age four. No relations were found at age six

No Bilingual Benefits Despite Relations Between Language Switching and Task Switching

Previous research has shown that bilingual children outperform monolinguals on tasks testing cognitive control. Bilinguals’ enhanced cognitive control is thought to be caused by the necessity to exert more language control in bilingual compared to monolingual settings. Surprisingly, between-group research of cognitive effects of bilingualism is hardly ever combined with within-group research that investigates relationships between language control and cognitive control. The present study compared 27 monolingual Dutch and 27 bilingual Turkish-Dutch children matched on age and fluid intelligence on their performance in a nonverbal switching task. Within the group of bilinguals, the relationship between nonverbal switching and language switching was examined. The results revealed no between-group differences on nonverbal switching. Within the bilingual sample, response times in the language switching and nonverbal switching tasks were related, although no relationships were found between accuracy, switching cost and mixing cost on both tasks. The results support the hypothesis that children utilize domain-general cognitive control in language switching, but this relationship does not entail that bilinguals have better cognitive control than monolinguals

Determinants of early lexical acquisition: Effects of word- and child-level factors on Dutch children’s acquisition of words

Previous research on the effects of word-level factors on lexical acquisition has shown that frequency and concreteness are most important. Here, we investigate CDI data from 1,030 Dutch children, collected with the short form of the Dutch CDI, to address (i) how word-level factors predict lexical acquisition, once child-level factors are controlled, (ii) whether effects of these word-level factors vary with word class and age, and (iii) whether any interactions with age are due to differences in receptive vocabulary. Mixed-effects regressions yielded effects of frequency and concreteness, but not of word class and phonological factors (e.g., word length, neighborhood density). The effect of frequency was stronger for nouns than predicates. The effects of frequency and concreteness decreased with age, and were not explained by differences in vocabulary knowledge. These findings extend earlier results to Dutch, and indicate that effects of age are not due to increases in vocabulary knowledge

Towards More Multilingual Practices in the Mathematics Assessment of Young Refugee Students: Effects of Testing Language and Validity of Parental Assessment

The study focuses on the assessment of young refugee students, and the role of language and parents therein. Low achievement at tests can stem from lack of knowledge of the content being tested. However, it can also be due to low proficiency in the language of testing. Additionally, poor communication between refugee parents and schools caused by language or cultural differences may lead to underestimation of children’s potential. We investigated, first, to what extent the language factor affects the performance of young Syrian refugee students in the Netherlands in mathematics and, second, the validity of parents’ judgements of their children’s mathematics ability. A linear mixed-effects model with random intercepts per participant was used to analyze the data. Results showed that the students performed significantly better in their mother tongue than in the school language. Additionally, parents’ ratings of their children’s mathematics ability correlated significantly with the mathematics scores on both versions of the tests. The study confirms the value of linguistically appropriate assessments and parental assessment when accommodating refugee students