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Nov 2, 2017 at 22:00 comment added guigux Thanks for this answer. I did not know that the joint distribution of the $k$ first order statistics had such a simple formula, that really helps.
Oct 29, 2017 at 9:48 history edited wolfies CC BY-SA 3.0
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Oct 29, 2017 at 7:07 comment added wolfies The above is all that is needed, other than the requisite software.
Oct 29, 2017 at 7:04 comment added user64494 Sorry, but the above is not any executed Mathematica code. You can present it through Dropbox, for example, as an exported PDF file..
Oct 29, 2017 at 6:49 comment added wolfies Using the mathStatica package for Mma, define the parent pdf as say: f = 1; domain[f] = {x, 0, 1}; . Then, in the $k = 2$ case, the joint pdf of the first 2 order statistics is given by: g = OrderStat[{1, 2}, f], and the desired cdf is simply: Prob[$x_1 + x_2 < z, g$]. For the first 3 order statistics, it is: g = OrderStat[{1, 2, 3}, f] etc
Oct 29, 2017 at 6:45 comment added user64494 Can you support your claims by Mathematica code?
Oct 29, 2017 at 6:38 history edited wolfies CC BY-SA 3.0
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Oct 29, 2017 at 6:29 history edited wolfies CC BY-SA 3.0
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Oct 29, 2017 at 5:46 history answered wolfies CC BY-SA 3.0