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A146205 Number of paths of the simple random walk on condition that the median applied to the partial sums S_0=0, S_1,...,S_n, n odd (n=15 in this example), is equal to half-integer values k+1/2, -[n/2]-1<=k<=[n/2]. 4
35, 35, 245, 245, 735, 735, 1225, 1225, 1225, 1225, 735, 735, 245, 245, 35, 35 (list; graph; refs; listen; history; text; internal format)



1) Closed-form expressions for sequences see Pfeifer (2010).

2) The median taken on partial sums of the simple random walk represents the market price in a simulation model wherein a single security among non-cooperating and asymetrically informed traders is traded (Pfeifer et al. 2009).

3) A146207=A146205+(0,A146206) see lemma 2 in Pfeifer (2010).


Pfeifer, C. (2010) Probability distribution of the median taken on partial sums of the simple random walk, Submitted to Stochastic Analysis and Applications


Table of n, a(n) for n=0..15.

C. Pfeifer, K. Schredelseker, G. U. H. Seeber, On the negative value of information in informationally inefficient markets. Calculations for large number of traders, Eur. J. Operat. Res., 195 (1) (2009) 117-126.


All possible different paths (sequences of partial sums) in case of n=3:

{0,-1,-2,-3}; median=-1.5

{0,-1,-2,-1}; median=-1

{0,-1,0,-1}; median=-0.5

{0,-1,0,1}; median=0

{0,1,0,-1}; median=0

{0,1,0,1}; median=0.5

{0,1,2,1}; median=1

{0,1,2,3}; median=1.5

sequence of integers in case of n=3: 1,1,1,1


A117692, A108347, A029460, A029466, A135553, A137272, A146206, A146207

Sequence in context: A142728 A316111 A316348 * A201067 A210320 A165856

Adjacent sequences:  A146202 A146203 A146204 * A146206 A146207 A146208




Christian Pfeifer (christian.pfeifer(AT)uibk.ac.at), Oct 28 2008, May 04 2010



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Last modified October 31 08:46 EDT 2020. Contains 338101 sequences. (Running on oeis4.)