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apollo911

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【答案】應(yīng)助回帖

They are the same.

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11樓2013-08-23 19:09:02

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11樓: Originally posted by apollo911 at 2013-08-23 19:09:02
They are the same.

In the paper I read, the "mean velocity" has a distribution along with y-axis which stands for the water depth from the river bed, while the "average velocity" was explained as "total discharge divided by the cross-section's area". So they seem not the same.

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makefulluseofmylife.

12樓2013-08-23 21:59:50

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apollo911

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12樓: Originally posted by 不銹蝙蝠 at 2013-08-23 21:59:50
In the paper I read, the "mean velocity" has a distribution along with y-axis which stands for the water depth from the river bed, while the "average velocity" was explained as & ...

‘total discharge divided by the cross-section's area’ I think this defination should be better.

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13樓2013-08-23 23:34:29

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etshao

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【答案】應(yīng)助回帖

mean在數(shù)學(xué)里面是指中位數(shù)
average就指咱們平時運算的均值。
僅供參考

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14樓2013-09-06 11:43:15

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14樓: Originally posted by etshao at 2013-09-06 11:43:15
mean在數(shù)學(xué)里面是指中位數(shù)
average就指咱們平時運算的均值。
僅供參考

謝謝回帖。這里的mean應(yīng)該不是中位數(shù)的解釋。Anyway, thanks all the same.

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makefulluseofmylife.

15樓2013-09-06 15:38:44

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匿名

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16樓2013-12-17 05:47:44

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befair

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【答案】應(yīng)助回帖

My three cents:
In general these two words should be equivalent in our daily life, in which we tend to say average more than mean. In scientific context there are however some distinctions to make. When it comes to data analysis, often average is referred to as arithmetic mean(even moving average), while in statistical terminology mean has a specific meaning, that is the expectation of a distribution. In this case one cannot say average any longer.

To come back to your question, my suggestions are as follows:
1. If you do data analysis "simplistically" on some velocity measurement values without statistical distributions involved, use average should be fine, or use arithmetic mean
2. If you try to model the velocity as a statistical distribution and then use the mean of (theoretical) distribution, I'd suggest you to stick to mean
Hope it helps

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Befairorbeaware

17樓2013-12-17 07:16:24

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hijack520

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【答案】應(yīng)助回帖

1.you don't need "it" here of "...o similar to another that I could not understand it accurately enough. ".
2. you will use plural form of "terms" instead of singular form of "term" here of '...what exactly is the difference between these two term?...'
3. you will use singular form of "equal" instead of "equals" here of '...Does "mean velocity" equals to "time-average velocity..."'

As to the question, as a terminlogy, to my point, a word definitely has clear connotation in a certain reserch filed. The difference can be figured out from published literatures of that research field.

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Dig,dig.~!

18樓2013-12-17 16:38:26

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hijack520

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【答案】應(yīng)助回帖

Also check wiki about "mean vs. average": http://en.wikipedia.org/wiki/Average

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Dig,dig.~!

19樓2013-12-17 16:54:59

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