如果在线性回归模型中增加一个特征变量，下列可能发生的有？（） A: R-squared 增大，Adjust R-squared 增大 B: R-squared 增大，Adjust R-squared 减小 C: R-squared 减小，Adjust R-squared 减小 D: R-squared 减小，Adjust R-squared 增大

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2022-07-01 问题

如果在线性回归模型中增加一个特征变量，下列可能发生的有？（） A: R-squared 增大，Adjust R-squared 增大 B: R-squared 增大，Adjust R-squared 减小 C: R-squared 减小，Adjust R-squared 减小 D: R-squared 减小，Adjust R-squared 增大

2021-04-14 问题

The standard error of estimate is based on:? squared deviations from the regression line.|negative values.|squared units of the independent variable.|the regression mean square error.

2021-04-14 问题

It is for this reason that Laplace’s operator(拉氏算子) is sometimes written as ▽2(read triangle squared).

2021-04-14 问题

拟合优度（R-Squared）是对样本回归直线与样本观测值之间拟合程度的检验。

2022-06-01 问题

Which of the following manifestations indicates early stage of rickets? () A: Harrison grooves and ribs valgus B: squared skull C: low spirits D: sweating, easily irritated E: convulsions or tetany

2021-04-14 问题

经研究发现，学生用于购买书籍及课外读物的支出与本人受教育年限和其家庭收入水平有关，对18名学生进行调查统计的回归分析结果如下： Dependent Variable: CONS Method: Least Squares Date: 06/04/14 Time: 09:51 Sample: 1 18 Included observations: 18 Variable Coefficient Std. Error t-Statistic Prob. C A 30.32236 -0.032173 0.9748 EDUC 104.3146 B 16.27592 0.0000 INC 0.402190 0.116348 C 0.0035 R-squared 0.979726 Mean dependent var 755.1500 Adjusted R-squared 0.977023 S.D. dependent var 258.6859 S.E. of regression 39.21162 Akaike info criterion 10.32684 Sum squared resid 23063.27 Schwarz criterion 10.47523 Log likelihood -89.94152 Hannan-Quinn criter. 10.34730 F-statistic 42.6394 Durbin-Watson stat 2.561395 Prob(F-statistic) 0.000000 写出A= B= C= 的值。写出上题中的样本回归函数；0.05的显著水平下，写出方程显著性检验的判断依据及结果

经研究发现，学生用于购买书籍及课外读物的支出与本人受教育年限和其家庭收入水平有关，对18名学生进行调查统计的回归分析结果如下： Dependent Variable: CONS Method: Least Squares Date: 06/04/14 Time: 09:51 Sample: 1 18 Included observations: 18 Variable Coefficient Std. Error t-Statistic Prob. C A 30.32236 -0.032173 0.9748 EDUC 104.3146 B 16.27592 0.0000 INC 0.402190 0.116348 C 0.0035 R-squared 0.979726 Mean dependent var 755.1500 Adjusted R-squared 0.977023 S.D. dependent var 258.6859 S.E. of regression 39.21162 Akaike info criterion 10.32684 Sum squared resid 23063.27 Schwarz criterion 10.47523 Log likelihood -89.94152 Hannan-Quinn criter. 10.34730 F-statistic 42.6394 Durbin-Watson stat 2.561395 Prob(F-statistic) 0.000000 写出A= B= C= 的值。写出上题中的样本回归函数；0.05的显著水平下，写出方程显著性检验的判断依据及结果

2022-05-31 问题

Alana decided to look up her body mass index (BMI) after completing the weight control lessons of CHEM181x. Answer parts (a) and (b) before clicking Final Check.a. How is this measure calculated? A: By dividing her weight in kg by her height in metres squared. B: By dividing her weight in kg by her body fat percentage squared. C: By subtracting her muscle mass percentage squared from her weight in kg. D: By subtracting her bone mass squared from her weight in kg.

Alana decided to look up her body mass index (BMI) after completing the weight control lessons of CHEM181x. Answer parts (a) and (b) before clicking Final Check.a. How is this measure calculated? A: By dividing her weight in kg by her height in metres squared. B: By dividing her weight in kg by her body fat percentage squared. C: By subtracting her muscle mass percentage squared from her weight in kg. D: By subtracting her bone mass squared from her weight in kg.

2022-10-27 问题