Exploring the implementation of early math assessments in kindergarten classrooms: A research-practice collaboration
https://onlinelibrary.wiley.com/doi/10.1111/mbe.12293 https://www.researchgate.net/publication/353467686_Exploring_the_Implementation_of_Early_Math_Assessments_in_Kindergarten_Classrooms_A_Research-Practice_Collaboration Research in cognitive development has highlighted that early numeracy skills are associated with later math achievement, suggesting that these skills should be targeted in early math education. Here we tested whether tools used by researchers to assess mathematical thinking could be useful in the classroom. This paper describes...
The Tenets of A/B Testing from Duolingo’s Master Growth Hacker
https://review.firstround.com/the-tenets-of-a-b-testing-from-duolingos-master-growth-hacker A/B TEST #1: Delayed Sign-Up Several years ago, Duolingo began tackling perhaps the most existential question for an app startup: what was causing the leak at the top of their funnel — and how could they stop it? “We were seeing a huge drop-off in the number of people...
How Etsy Evolved Product Prioritization Through Growth
https://firstmark.medium.com/how-etsy-evolved-product-prioritization-through-growth-48af506db3fe The Core Business: The Vital Few When a company experiences early growth, it’s easy to get into growth hacking mode — pursuing all the “worthwhile many” ways that could help the company grow even faster. However, leaning into growth too early can be a critical mistake, especially if your...
Building a data team at a mid-stage startup: a short story
https://erikbern.com/2021/07/07/the-data-team-a-short-story.html “The backdrop is: you have been brought in to grow a tiny data team (~4 people) at a mid-stage startup (~$10M annual revenue), although this story could take place at many different types of companies. It’s a made up story based on n-th hand experiences (for n ≤ 3),...
Stable individual differences in infants’ responses to violations of intuitive physics
https://www.pnas.org/content/118/27/e2103805118 Infants look longer at impossible or unlikely events than at possible events. While these responses to expectancy violations have been critical for understanding early cognition, interpreting them is challenging because infants’ responses are highly variable. This variability has been treated as an unavoidable nuisance inherent to infant research. Here...
Predicting trends in the quality of state-of-the-art neural networks without access to training or testing data
https://www.nature.com/articles/s41467-021-24025-8 https://pypi.org/project/weightwatcher/ In many applications, one works with neural network models trained by someone else. For such pretrained models, one may not have access to training data or test data. Moreover, one may not know details about the model, e.g., the specifics of the training data, the loss function, the...
Moral dilemmas and trust in leaders during a global health crisis
https://www.nature.com/articles/s41562-021-01156-y Trust in leaders is central to citizen compliance with public policies. One potential determinant of trust is how leaders resolve conflicts between utilitarian and non-utilitarian ethical principles in moral dilemmas. Past research suggests that utilitarian responses to dilemmas can both erode and enhance trust in leaders: sacrificing some people...
The effects of handwriting experience on literacy learning
https://journals.sagepub.com/doi/10.1177/0956797621993111 https://hub.jhu.edu/2021/07/07/handwriting-more-effectively-teaches-reading-skills-brenda-rapp/ Previous research indicates that writing practice may be more beneficial than nonmotor practice for letter learning. Here, we report a training study comparing typing, visual, and writing learning conditions in adults (N = 42). We investigated the behavioral consequences of learning modality on literacy learning and evaluated the...
Same data, different conclusions: Radical dispersion in empirical results when independent analysts operationalize and test the same hypothesis
https://www.sciencedirect.com/science/article/pii/S0749597821000200 In this crowdsourced initiative, independent analysts used the same dataset to test two hypotheses regarding the effects of scientists’ gender and professional status on verbosity during group meetings. Not only the analytic approach but also the operationalizations of key variables were left unconstrained and up to individual analysts. For...
Decision-making ability, psychopathology, and brain connectivity
https://www.cell.com/neuron/fulltext/S0896-6273(21)00285-3 Decision-making is a cognitive process of central importance for the quality of our lives. Here, we ask whether a common factor underpins our diverse decision-making abilities. We obtained 32 decision-making measures from 830 young people and identified a common factor that we call “decision acuity,” which was distinct from...
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