Two way classification models with random effects are used widely.The variance components in these models are often estimated by ANOVA estimates. 摘要两向分类随机效应模型是一种有着广泛应用的统计模型，对其中的方差分量，经常使用方差分析法来估计。
However, a chit-pull system differs in a number of ways from dice-rolling, which is another method for obtaining random results. 但是图标驱动系统和同为产生随机效果的掷骰有许多的不同。
