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You've got a type mismatch. Foreign doesn't accept
float numbers to be passed as the 2nd argument. You've made a
formula that you've put quotes around, mistakenly notifying Foreign() to
NOT evaluate it as a mathematical formula but rather to accept it as a
string of characters, i.e., as a written word. Foreign's second
argument does indeed require a string, but only certain strings referring
to datafields, like: "open, low, close, O, L, C" etc.
Read the online docs here:
http://www.amibroker.com/guide/afl/afl_view.php?id=54
What's confusing for you is that AB didn't balk (though it should have!)
at accepting such nonsense in the 2nd argument, and instead allowed it
but treated it for some reason as "C". That's why you got
the same result from both ways.
Try this instead, off the top of my head. Let me know if it
works.
Var1 = ROC(Foreign(Ticker1, "C"), 1);
Regarding your second question: Correlation() doesn't (or at least
shouldn't!) automatically convert prices to ROCs without being told to do
so explicitly by you. Rather, it should examine a correlation
between two arrays of your choice, without trying to second guess what's
in the arrays.
-Paul
At 05:46 PM 3/5/2005, you wrote:
Var1 =
Foreign(Ticker1,
"C");
To this:
Var1 =
Foreign(Ticker1,
"ROC(C,1)");
I'm not a great programmer so I have two
questions: 1. is this the correct way of manipulating the
foreign argument and 2. is the original formula already
correctly measuring the correlations by using ROC vs. closing
price?
Check AmiBroker web page at:
http://www.amibroker.com/
Check group FAQ at: http://groups.yahoo.com/group/amibroker/files/groupfaq.html
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