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    equality of two samples




    Hello,

    I have 10 values of two sample for each month for the 1987-1996 period. Is it possible to test if these two samples are equal? if so, which methodoloy i should use?
    Best
    J

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    Could you clarify?

    If I'm reading correctly, for each month in the 1987-1996 time period, you have 2 samples of 10 data points each?

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    The way u interpreted it is exactly what i meant

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    I would start out with 2-way ANOVA (Analysis of Variance), using the variables:

    (1) Month/Year
    (2) Sample Number

    ANOVA will tell you if the sample-to-sample variation, within each month, is significant, while controlling for month-to-month variation. It will also tell you if there is an interaction between months and samples.

    Do a means plot for each variable, and also an interaction plot - try to look for patterns (is sample 1 always bigger than sample 2? is one sample bigger in particular months every year? are there other interesting patterns?)

    A good place to look for info is here:
    http://davidmlane.com/hyperstat/factorial_ANOVA.html

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