[Scipy-tickets] [SciPy] #802: problems with skew and kurtosis for some distributions

SciPy Trac scipy-tickets@scipy....
Sat Dec 4 11:33:32 CST 2010


#802: problems with skew and kurtosis for some distributions
-------------------------+--------------------------------------------------
 Reporter:  josefpktd    |       Owner:  josefpktd
     Type:  defect       |      Status:  new      
 Priority:  normal       |   Milestone:           
Component:  scipy.stats  |     Version:           
 Keywords:               |  
-------------------------+--------------------------------------------------

Comment(by josefpktd):

 here is an updated shortlist comparing the results of the stats() method
 with results from expect

 Skew

 {{{
 >>> print SimpleTable(skew, headers=['distname', 'diststats', 'expect'])
 ===========================================
  distname     diststats         expect
 -------------------------------------------
   mielke    7.59540085257   6.91088104518
    fisk     38.7938857832   12.9246301568
  foldnorm   0.971407236222  0.202188769695
  gilbrat    6.18487713863   6.17333365849
  loglaplace  16.9237038681   11.2535633383
 fatiguelife 0.0408718910942  3.93239048725
  powerlaw  -0.906960466124 -0.420181302329
    ncf      40747519832.7   8.94481163856
     f       1.93130205529   1.80641432186
 -------------------------------------------
 }}}

 Kurtosis

 {{{
 >>> print SimpleTable(kurt, headers=['distname', 'diststats', 'expect'])
 ===========================================
  distname     diststats         expect
 -------------------------------------------
   mielke    -149.405089743  362.442518204
    fisk     -224.659270348  2099.30241789
  foldnorm   2.70517285483  -0.294828589688
 tukeylambda  -2.98365209914 -0.897302898918
  dweibull   1.90893020344   -1.06484211833
  gilbrat    110.936392176   107.859563214
  loglaplace  -164.332555303   1330.2395564
  genpareto   14.8285714286   14.8119563403
  lognorm    81.1353811489   79.6180870122
    burr     112616.270172   6.21265707889
    ncf     -239984516633.0  13492.9902378
     f        7.9138697318   7.06539159862
    nct      -409040.407062  0.605963897342
   rdist     -2.56785479799  -1.53846154515
 -------------------------------------------
 }}}

-- 
Ticket URL: <http://projects.scipy.org/scipy/ticket/802#comment:1>
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