S&P Watch: Dramatic Shift for 200-Day Moving Average?

Smita Sadana  Jun 17, 2009 4:15 pm

S&P Watch: Dramatic Shift for 200-Day Moving Average?
 
This support is going to act supportive at much lower levels.
 

 
Torture numbers, and they’ll confess to anything.

The S&P 500's 200-day simple moving average -- the one that everyone has become so accustomed to -- is in for a dramatic shift soon.

Let’s go back to Statistics 101 for this. The 200-DMA represents the average closing price of a stock over the most recent 200 days. In the context of the market, 200 days means approximately 10 months.

Now let's take a look at the chart. As we roll over to July, the 200-DMA is going to start discarding the high readings of September and October, one day at a time.


Click to enlarge


Assuming the market stays in the vicinity of 900, that implies that a higher number is going to be deleted every day -- say in the 1100-1200 range -- and a smaller number will be added (in the 900s). This would force the 200-DMA to go down, one day at a time.

How is this information relevant besides as a mental exercise? Well, the 200-DMA "support" -- the one that the media has been so keenly watching -- is going to act "supportive" at lower levels.

Of course, if the market goes dramatically higher, there won't be much impact; and if it falls, the 200-DMA will go even lower.

There are many other implications, but this is an important one.This isn't actionable today, but it's certainly something to keep in mind over the next 2 months.

I know what you’re thinking: First, economics; now, statistics -- which incidentally was my favorite course, along with econometrics (Check out this post, on UNG, for more). Trust this content at your own peril.

Smita Sadana offers in-depth research on historical bear markets and provides you with 10 indicators she's found that together confirm the beginning of a new bull market.  Learn them today so you know when it's safe to invest again.  Bull Market Timer - 7 day money back guarantee.
43 of 46 (93%) found this helpful
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Comments (5) See All Comments »
06-17-2009, 4:59 pm
LOL, thanks Smita! I started laughing with the first line. It brought to mind Monty Python's "Spanish Inquisition" sketch and gave me a smile that's still there :)

Solid analysis and sensible advice, that'
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06-17-2009, 5:18 pm
Doesn't that make the market at a juncture more like late 2001 where the S&P crossed over the falling 200 DMA only to fall back on one more crash leg down?
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06-17-2009, 5:34 pm
I would agree with that -- Looks to me like one more down leg is coming.
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06-18-2009, 8:26 am
Just for grins, run the 150 and 100 day moving averages and that will give you a better idea of where the 200 dma will stabilize...the answer is around 840-850
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06-24-2009, 4:52 am
THis is EXACTLY why you use the Exponential Moving Average instead of the SMA. EMA's put more emphasize on recent market performance. Look at the 200 day SMA and the 200 day EMA and you will notice that the EMA has turned almost flat due to t
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