Mohamed A.Abdel-Fattah Mansour
2015-Sep-24 18:31 UTC
[R] Comparing two populations based on the percentile values calculated from two independent samples
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]]
John Sorkin
2015-Sep-24 18:52 UTC
[R] Comparing two populations based on the percentile values calculated from two independent samples
Mohamed, You probably should seek the help of a local statistician, and should read about Pearson's chi square test and Fisher's exact test. John John David Sorkin M.D., Ph.D. Professor of Medicine Chief, Biostatistics and Informatics University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine Baltimore VA Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 (Phone) 410-605-7119 (Fax) 410-605-7913 (Please call phone number above prior to faxing)>>> "Mohamed A.Abdel-Fattah Mansour via R-help" <r-help at r-project.org> 09/24/15 2:42 PM >>>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]] ______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Confidentiality Statement: This email message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message.
Cade, Brian
2015-Sep-24 19:13 UTC
[R] Comparing two populations based on the percentile values calculated from two independent samples
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]] > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.[[alternative HTML version deleted]]