I have an array called "stocks" which contains numeric dates, ticker
symbols,prices, etc.
> stocks[1:3,]
DATE TICKER PERMNO EXCHCD TSYMBOL TRDSTAT SHROUT PRC
RET
1 19950131 EWST 10001 3 EWST A
2224 -7.75000 -0.031250
2 19950228 EWST 10001 3 EWST A
2224 7.54688 -0.026210
3 19950331 EWST 10001 3 EWST A
2244 7.50000 0.006377
However when I call the part of the array dealing with the Ticker, I
get:
> stocks[2,2]
[1] EWST
16185 Levels: A AA AAA AAAB AAABB AAB AABC AAC AACB AACC AACE AACI ...
ZVXI
Thus, when I reference this later, I get a numeric result and not the
symbol? Is this because I need to change the format of stocks[,2] or
because it has these extra "levels".
For example:
# START FIRST PORTFOLIO
port1=matrix(0, ctr,3)#matrix for portfolio starting in June 30th 1995
c=0
# sort data at time t=1 (June 30th, 1995)
for (i in 1:T)
{
if (stocks[i,1]==19950630)
{
c=c+1
row=i
price = abs(stocks[i,8])
port1[c,1]=stocks[i,1] #put date in first
column
port1[c,2]=stocks[i,2] #ticker
port1[c,3]=price #price
}
}
WHEN I TRY
> port1[1,2]
[1] 4934
I SHOULD GET
[1] EWST
????????
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