求助 Business Analysis 考试48题 ??????

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QUESTION NO: 48 CORRECT TEXT


A linear model has the following characteristics:
*A dependent variable (y)
*One continuous variable (xl), including a quadratic term (x12)
*One categorical (d with 3 levels) predictor variable and an interaction term (d by x1)
How many parameters, including the intercept, are associated with this model?
Enter your numeric answer in the space below. Do not add leading or trailing spaces to your
answer.


填空题目, 答案是 7
请问为什么是7? 请问是哪7个呢? 谢谢!!!

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关键词：Business Analysis Analysi Analys alysis continuous following including Business leading

y=a+x1+Q+d0+d1+d0x1+d1x1

co_fund 发表于 2016-2-25 18:15
y=a+x1+Q+d0+d1+d0x1+d1x1

谢谢你的解释.
这个问题我也google了一下，后来明白了，就是interaction term需要和x1和x12都Interact。
7个变量分别是：
constant
x1
x12
d level1
d level 2
d by x1
d by x12

sauss 发表于 2016-2-26 01:52
谢谢你的解释.
这个问题我也google了一下，后来明白了，就是interaction term需要和x1和x12都Interact。 ...

an interaction term (d by x1)
为什么 有X12？