Are Farm Size Distributions Bimodal? Evidence from Kernel Density Estimates of Dairy Farm Size Distributions
用非参数密度估计方法分析1989和1993年美国奶牛场规模数据，发现其分布并非常见的双峰形态，挑战了农业经济学中的一个典型化事实。
Abstract One often hears and sees reference to bimodal distributions of farm size. This notion seems to have become one of the stylized facts about American agriculture. Dairy farm size distributions are prime candidates to exhibit a bimodal size distribution. Older dairy farms tend to be significantly smaller than new dairy farms and there are well known regional size differences. Nonetheless, our analysis of 1989 and 1993 U.S. dairy farm size distributions, using nonparametric density estimation techniques, reveals that U.S. dairy farm size distributions are not bimodal. This result holds across years for herd size, total farm sales, and acres operated.