Gersh: We still have a problem. Although the Yahoo chart shows "NDX" on it, it is actually for the NYSE. Please don't ask; just scratch your head like me. I cannot explain that. Instead, I went through the closing figures from Yahoo and calculated the ARMs using their figures. I did this after I had checked DBC to make sure that the Nasdaq Composite (TRINQ on their system) was .64. I used the Arms formula from memory and not my spreadsheet. So I am assuming it is correct. At least, it matches up to the Yahoo numbers for the NYSE and DBC number for Nasdaq composite.
Here is the Arms formula.
Key:
advancing issues = (AI)
declining issues = (DI)
advancing volume = (AV)
declining volume = (DV)
Calculation:
(AI/DI)/(AV/DV)
From the Yahoo data on the NYSE we have
(1214/1746)/(304,346,080/392,054,080)
=.69530/.77628
=.89568
=.90
From the Yahoo data on the Nasdaq (Composite)
(1796/2030)/(536,380,320/389,919,008)
=.88472/1.37561
=.64314
=.64
For the last week, I noticed the Yahoo feed for volume was slow. It appeared to be lagging up to a minute or two. So there may be a problem with the Yahoo intraday feed. Or it may be the Quote.com feed. However, I think what we saw yesterday is to significant a difference between the two reporting sources. I will do the same calculation with the WSJ-Interactive data later. I have a few messages waiting, so someone may have already figured this out. |
