When the values are nonnegative, their ratios are, too.
There must be something different happening if there are negative values.
Am 03.04.20 um 03:29 schrieb HH PackRat:
On 4/2/20, Raul Miller <[email protected]> wrote:
One other thing -- after sleeping on this, I realized I had two
conflicting views about negative numbers in the stock values you were
working with:
(*) One is that negative numbers may appear in the data.
(*) The other is that negative numbers do not appear in the data.
Obviously, these cannot both be true. But the implementation should be
changed to fit whichever is the correct statement: ...
If negative numbers do not appear in the data, the whole elaborate
date cleaning process should be eliminated ...
Stock prices are never negative because they show value. If prices
ever reach zero, the stocks are worthless. In other words, stock
prices are always non-negative.
However, negative numbers *can* occur, for example, in currency
markets (and their quoted "prices"), where you deal with *ratios*
(comparisons) between currencies, not absolute values. An example
might be the EURUSD market, where the value comparison is between the
Euro and the US Dollar. In general, this is why exchange rates can
vary from day to day when you travel internationally and convert
currencies at borders.
But the table I'm dealing with is 3,000 *stocks*, so negative numbers
don't apply.
I hope this helps,
Thanks--I appreciate your help!
Harvey
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