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Topic: comparison between two value in a sample, please help...
Replies: 1   Last Post: Aug 16, 2012 12:29 PM

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Jinsong Zhao

Posts: 21
Registered: 11/27/10
comparison between two value in a sample, please help...
Posted: Aug 16, 2012 5:29 AM
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Hi there,

The following data is obtained from a long-term experiments. In the data
set, ``Year'' is for sampling time, ``N'' is the tested property, and
``N.sd'' is the standard deviation of 3 times measurements of ``N'' of
the same sample.

Year N N.sd
1952 561.7400 33.69357
1963 709.0100 27.84428
1976 713.1600 33.20421
1998 755.3533 57.29368
2008 865.0033 51.11501

Now I hope to test whether the variation between different year is
significant or not. For example, does ``N'' in 1952 significantly differ
with that in 2008?

However, because of the historical reason, the experiments did not set
replications. And the ``Year'' here is a continuous variable. So, the
tradition ANOVA can not be applied here. Is there any method that I can
apply in this situation?

Any suggestions will be really appreciated. Thanks in advance.

Regards,
Jinsong





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