[Aavso-photometry] Uncertainty

[Lenny Abbey]

Oops. I thought I was in another list.

Sorry.

Lenny


At 09:25 PM 11/19/2007, Lenny Abbey wrote:
>Rich, you should ask this question on the AAVSO list:
>
>"AAVSO Discussion" <aavso-discussion at mira.aavso.org>
>
>They are the experts, though you may find some accurate information here.
>
>Lenny
>
>
>
>At 08:55 PM 11/19/2007, Richard Harvan wrote:
>>Dear All,
>>           I would like to get your opinion on my calculation of 
>> uncertainty.  The procedure I am writing about calculates the 
>> standard deviation of the variable and the check star.  These 
>> values are then combined in quadrature with the stated uncertainty 
>> of the photometry of the comp star and check star.  Is this a 
>> reasonable method or am I going overboard.
>>                     I saw in a textbook that the uncertainty of an 
>> average was the standard deviation divided by the square root of 
>> the sample size.  When I applied this to my data the calculated 
>> value was much less than the stated uncertainty.  This seemed too 
>> good to be true, so I have doubts about applying this to my 
>> measurements.  What is your opinion?
>>   Thanks for your help in advance.
>>
>>   Rich Harvan
>>
>>
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