碰到一全英文的题目，不是很理解，能进来帮忙解答下题目或者答题思路吗

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1.   [8] Make a binary infix operator called %ols% that takes thearguments x and y and returns the ordinary least squares regressioncoefficients for regressing y on x.  Inthis function x and y may any combination of vectors or matrices. Rather thanusing a built in R function, use the equation we saw in Question 2d) of thesecond assignment. This function should add a column of 1s to x so that anintercept is fit.  For examplex<-1:10; y<-2+3*x; y%ols%x returns: the vector 2, 3.

i)                  Regress ozone on temperature.  

ii)                Try replicating the model in Q1 f) by setting y to ozoneand x to a matrix where the first column contains radiation and the next twocolumns contain wind and temperature, respectively. Do this part in oneexpression.

2d)题目如下：

Assume that thereis an approximate linear relationship between Illiteracy and Murder rates.Given the design matrix defined above, we can define a simple linear modelas y=Xb+e where y (Murder) is the dependent variable, X is thedesign matrix (or matrix of independent variables), b is the vector ofparameters and e is the error term. The least squares estimate of b is:  bhat=(XtX) -1Xt y.Write an expression to calculate bhat in R. Note that Xt is thetranspose of X.

ozone 和 temperature 来自于下表：

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关键词：全英文 coefficients combination coefficient regression 答题

期末最后的大作业，不胜感激啊

挺好玩的题目，自己编一个操作符。楼主肯定能做出来

nuomin 发表于 2015-4-20 21:04
挺好玩的题目，自己编一个操作符。楼主肯定能做出来

嗯嗯，谢谢肯定，不过能指点下题目大意或者思路吗，英文能力是硬伤，理解了题目应该能解答的

有前辈能指点一下吗

It's about conducting a linear regression model using matrix operation. Group your data in a data frame or matrix where y (the 1st column) is the response variable and the rest of the columns are explanatory variables.
The R code
y = da[,1]
x = cbind(1, da[,2], da[,4], da[,3])
beta = solve(t(x)%*%x)%*%(t(x)%*%y) #the estimates of beta

waterhorse 发表于 2015-4-21 22:32
It's about conducting a linear regression model using matrix operation. Group your data in a data fr ...

哥们，你这个貌似对2d)的求解，目前求助的是上面的那个题目，谢谢啊

kizgel 发表于 2015-4-22 14:15
哥们，你这个貌似对2d)的求解，目前求助的是上面的那个题目，谢谢啊

不好意思，您没错，刚刚没仔细看，现在已经解答了，谢谢啊

此题已经没问题了，谢谢各位