如何将行中的字符值转换为 R 中的列

Question

I want to use a for loop to compute cumulative abnormal returns in R and have the dates in column 1, company names (comn) in 2, and stock prices (prccd) in 3. However, to compute abnormal returns I first need to compute the returns and thus need the company names with subsequent stock prices to be able to do this. Now my df looks like this;

Date	conm	prccd
2016-11-02	X	1
2016-11-02	Y	2
2016-11-02	Z	3

And thus need the data frame to look like:

Date	X	Y	Z
2016-11-02	1	2	3
2016-11-03	2	3	4
2016-11-04	3	4	5

Answer 1

Maybe you want to transform your dataframe, dcast function in data.table would help. You can see here ( how to transform rows to columns in R ) for usage