[R] Comparing two populations based on the percentile values calculated from two independent samples

[Cade, Brian]

You can use quantile regression (in quantreg package) to compare
percentiles between two groups in a linear model formulation.  If you are
really interested in "equivalence" testing and not just using the term
informally, you might check out Cade (2011.  Estimating equivalence with
quantile regression.  Ecological Applications 21: 281-289) for some
examples.

Brian

Brian S. Cade, PhD

U. S. Geological Survey
Fort Collins Science Center
2150 Centre Ave., Bldg. C
Fort Collins, CO  80526-8818

email:  cadeb at usgs.gov <brian_cade at usgs.gov>
tel:  970 226-9326


On Thu, Sep 24, 2015 at 12:31 PM, Mohamed A.Abdel-Fattah Mansour via R-help
<r-help at r-project.org> wrote:

> Dear AllI Have the data for two samples drawn from two different
> populations
> |
>
>   |
>
>   |
>
>   |
>
>   |
>
>   |  Percentiles
>
>   |
> |
>
>   |  Mean
>
>   |  STD
>
>   |  Min
>
>   |  Max
>
>   |  5th
>
>   |  25th
>
>   |  50th
>
>   |  75th
>
>   |  95th
>
>   |
> |  Sample 1
>
>   |  25
>
>   |  2
>
>   |  16
>
>   |  30
>
>   |  18
>
>   |  20
>
>   |  26
>
>   |  27
>
>   |  29
>
>   |
> |  Sample 2
>
>   |  26
>
>   |  2.1
>
>   |  21
>
>   |  32
>
>   |  17
>
>   |  21
>
>   |  27
>
>   |  28
>
>   |  30
>
>   |
>
>
>   I need to test the equivalence of the two samples regarding percentiles.
>  Dr. Mohamed A.Abdel-Fattah Mansour Associate Prof. of Industrial
> Engineering Industrial Engineering Department Faculty of Engineering KKU
>         [[alternative HTML version deleted]]
>
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