A Study of the Microdynamics of Early-Childhood Learning
利用中国农村家访项目的独特数据，研究了儿童技能的周度演变，发现技能在不同阶段不具有统一尺度，并构建了一个多技能动态随机生产模型来解释学习效果的消退。
This paper investigates the weekly evolution of skills as measured by unique data from a widely-emulated early childhood home-visiting program in rural China. The design of the study avoids input endogeneity issues and lack of comparable measures of skills that plague previous studies. Skills, nominally classified as the same, in fact, do not appear to share a common unit scale across levels. They are produced by skill-lifecycle-stage-specific learning processes. A novel dynamic stochastic skill production model for multiple skills is developed, aligning with empirical evidence. The model explains the "fadeout" of measures of learning through forgetting or depreciation of skills.