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# 统计作业代写Statistics代考|Group-Level Variables and Cross-Level Interactions

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• Date Analysis数据分析
• Actuarial Science 精算科学
• Bayesian Statistics 贝叶斯统计
• Generalized Linear Model 广义线性模型
• Macroeconomic statistics 宏观统计学
• Microeconomic statistics 微观统计学
• Logistic regression 逻辑回归
• linear regression 线性回归

A key advantage of multilevel models is that they permit not only individuallevel variables, such as sex and marital status, but also group-level explanatory variables. The MultiLevel dataset, for example, includes variables that measure the towns’ populations and levels of economic disadvantage. We might be interested in whether, say, household income is lower, on average, in larger towns or in more disadvantaged areas. LRM15.4 illustrates a model that examines these inquiries. As shown by the lmer function, we simply add group-level variables to the fixed portion of the model.

## 统计作业代写STATISTICS代考|random-slope

We may also estimate the proportion of variance accounted for between groups (towns) using information from the between-group variances $\left(\sigma_{u}^{2}\right)$ in the one-way ANOVA model and the full model, which are found in the Random effects panels of the output in the idcomm (Intercept) row. Based on LRM15.1 and LRM15.4, this goodness-of-fit measure is shown in Equation 15.9.
$$\frac{0.172-0.140}{0.172}=0.19$$
The model accounts for about $19 \%$ of the variability in income between towns. Given that the male slope coefficient also has a variance component, we could also determine the proportion of variance explained between groups due to the random-slope component.

## 统计作业代写STATISTICS代考|RANDOM-SLOPE

0.172−0.1400.172=0.19

## matlab代写

MATLAB是一个编程和数值计算平台，被数百万工程师和科学家用来分析数据、开发算法和创建模型。

MATLAB is a programming and numeric computing platform used by millions of engineers and scientists to analyze data, develop algorithms, and create models.