| Re: (a-b, b-c, c-d, d-e,...) [message #56038] |
Sat, 29 September 2007 06:28 |
George N. White III
Messages: 56
Registered: September 2000
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On Sat, 29 Sep 2007, jschwab@gmail.com wrote:
>
>
> On Sep 28, 10:48 am, Jimoid <jimmy.cul...@gmail.com> wrote:
>> I have used IDL to analyse data in my MSc project. I am writing up my
>> dissertation now and want to know if there is a specific term for one
>> of the processes I have used.
>>
>> The data are in several vectors of the form (a, b, c, d,...). I have
>> found the change in value from one point to the next and then analysed
>> those, i.e. the data is in the format (a-b, b-c, c-d, d-e,...). Can
>> someone tell me what the name for this process is (if there is one,
>> and I'm sure there is).
>>
>> Many thanks
>
> I have always heard such values referred to as "first differences".
I've been calling this "first-order differences":
< http://www.answers.com/topic/first-order-difference?cat=tech nology> cites
McGraw-Hill Dictionary of Scientific and Technical Terms.
--
George N. White III <aa056@chebucto.ns.ca>
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| Re: (a-b, b-c, c-d, d-e,...) [message #56039 is a reply to message #56038] |
Fri, 28 September 2007 22:06  |
jschwab@gmail.com
Messages: 30
Registered: December 2006
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Member |
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On Sep 28, 10:48 am, Jimoid <jimmy.cul...@gmail.com> wrote:
> I have used IDL to analyse data in my MSc project. I am writing up my
> dissertation now and want to know if there is a specific term for one
> of the processes I have used.
>
> The data are in several vectors of the form (a, b, c, d,...). I have
> found the change in value from one point to the next and then analysed
> those, i.e. the data is in the format (a-b, b-c, c-d, d-e,...). Can
> someone tell me what the name for this process is (if there is one,
> and I'm sure there is).
>
> Many thanks
I have always heard such values referred to as "first differences".
Cheers,
Josiah
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