Thursday, September 16, 2004
Hi Prof., I've a question about the meaning of a variable in the GLRT. What is Xw? It refers to location of window on the road or window size or neither. If Xw refers to location, then what is Xnotw? -EH
Xw is the number of injury accidents inside the window. Xnw is the number of injury accidents outside the window. The idea is that you compute these (and the GRLT statistic or some other statistic of your choosing) for every window. D.
So, Nw is no. of non-injury accidents within the window, Nnw is the no. of non-injury accidents outside the window. Am I right? -EH
sorry for the delay - I didn't spot your question here. Nw is the total number of accidents in the window (injury + noninjury). Nnw is the total number of accidents outside the window. D.
Xw is the number of injury accidents inside the window. Xnw is the number of injury accidents outside the window. The idea is that you compute these (and the GRLT statistic or some other statistic of your choosing) for every window. D.
So, Nw is no. of non-injury accidents within the window, Nnw is the no. of non-injury accidents outside the window. Am I right? -EH
sorry for the delay - I didn't spot your question here. Nw is the total number of accidents in the window (injury + noninjury). Nnw is the total number of accidents outside the window. D.
