Boys and girls. It is known that statistics is a great tool of business PhD study. Uptill now, I have only the knowledge of the probability and statistics, this semester, I took the elective of econometrics. Without any PhD education before, I do not know what other statistics courses that I can prepare for.
What is the matrix correlation? While I was reading a paper by Churchil (1979) on how to design the scale items, I found myself lack of some foundation courses. But I do not know which course or text books told these knowledge .
Thanks
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