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I looked more closely at the values. It appears that what MS is doing is
taking the first data point and treating it as though it was the simple average
(i.e. start point) and then calculates EMAs based on that point. However,
it only displays data starting with the 5th day. That method will lead to
a small difference in the two methods.
Ron wrote:
Larry,
I ran a tiny experiment. I loaded only the number of days data in MS that
I was going to use for my calculation in Excel. Then copied and pasted the
MS data into Excel. The EMA numbers were the same to 4 decimal places when
I did that.
Ron
Ron wrote:
Larry,
I'm guessing the issue is the starting point.
The numbers will be different depending on from where the moving average
is calculated (started) which is dependent on the days loaded in MS. You
can see this for yourself by applying an EMA to a ticker, then note the
value for the most recent date when you have very few days loaded vs.
the value when you have many more days loaded.
I believe the numbers should match up, if they are fed exactly the same
data.
Try loading only the most recent 10 days in MS (those are the days on
which you're basing your Excel calculation) and see if the numbers match
up then.
Ron
lseldin wrote:
Ron,
I was able to get your spreadsheet from Yahoo files.
I am not getting the same results from MetaStock.
My data file has these inputs:
Close EMA PERIODS 5
1098.7 EXPONENT 0.333333333
1113.98999 1-Exponent 0.666666667
1121.530029
1119.550049
1117.48999 1114.252012 Starts with 5 period SMA
1107.300049 1111.934691
1113.890015 1112.586465
1122.410034 1115.860988
1138.109985 1123.277321
1135.530029 1127.361557
If I am reading your spreadsheet correct, your MA exp (5) is:
1127.36
MetaStock says 5 period EXP is: 1111.51
MetaStock says 10 period EXP is: 1116.99
Can you help me get the numbers to match?
Thanks for your patience.
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