Characterization of Probability Distributions via Functional Equations of Power-Mixture Type
We study power-mixture type functional equations in terms of Laplace–Stieltjes transforms of probability distributions on the right half-line <inline-formula><math display="inline"><semantics><mrow><mo>[</mo><mn>0</mn><mo>,</mo>&l...
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doaj-16d87de1e942461b8781596bae02cd0c2021-01-30T00:04:25ZengMDPI AGMathematics2227-73902021-01-01927127110.3390/math9030271Characterization of Probability Distributions via Functional Equations of Power-Mixture TypeChin-Yuan Hu0Gwo Dong Lin1Jordan M. Stoyanov2National Changhua University of Education, Changhua 50058, TaiwanSocial and Data Science Research Center, Hwa-Kang Xing-Ye Foundation, Taipei 10659, TaiwanInstitute of Mathematics & Informatics, Bulgarian Academy of Sciences, 1113 Sofia, BulgariaWe study power-mixture type functional equations in terms of Laplace–Stieltjes transforms of probability distributions on the right half-line <inline-formula><math display="inline"><semantics><mrow><mo>[</mo><mn>0</mn><mo>,</mo><mi>∞</mi><mo>)</mo><mo>.</mo></mrow></semantics></math></inline-formula> These equations arise when studying distributional equations of the type <inline-formula><math display="inline"><semantics><mrow><mi>Z</mi><mover><mo>=</mo><mi mathvariant="normal">d</mi></mover><mi>X</mi><mo>+</mo><mi>T</mi><mi>Z</mi></mrow></semantics></math></inline-formula>, where the random variable <inline-formula><math display="inline"><semantics><mrow><mi>T</mi><mo>≥</mo><mn>0</mn></mrow></semantics></math></inline-formula> has known distribution, while the distribution of the random variable <inline-formula><math display="inline"><semantics><mrow><mi>Z</mi><mo>≥</mo><mn>0</mn></mrow></semantics></math></inline-formula> is a transformation of that of <inline-formula><math display="inline"><semantics><mrow><mi>X</mi><mo>≥</mo><mn>0</mn></mrow></semantics></math></inline-formula>, and we want to find the distribution of <i>X</i>. We provide necessary and sufficient conditions for such functional equations to have unique solutions. The uniqueness is equivalent to a characterization property of a probability distribution. We present results that are either new or extend and improve previous results about functional equations of compound-exponential and compound-Poisson types. In particular, we give another affirmative answer to a question posed by J. Pitman and M. Yor in 2003. We provide explicit illustrative examples and deal with related topics.https://www.mdpi.com/2227-7390/9/3/271distributional equationLaplace–Stieltjes transformBernstein functionpower-mixture transformfunctional equationcharacterization of distributions |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Chin-Yuan Hu Gwo Dong Lin Jordan M. Stoyanov |
spellingShingle |
Chin-Yuan Hu Gwo Dong Lin Jordan M. Stoyanov Characterization of Probability Distributions via Functional Equations of Power-Mixture Type Mathematics distributional equation Laplace–Stieltjes transform Bernstein function power-mixture transform functional equation characterization of distributions |
author_facet |
Chin-Yuan Hu Gwo Dong Lin Jordan M. Stoyanov |
author_sort |
Chin-Yuan Hu |
title |
Characterization of Probability Distributions via Functional Equations of Power-Mixture Type |
title_short |
Characterization of Probability Distributions via Functional Equations of Power-Mixture Type |
title_full |
Characterization of Probability Distributions via Functional Equations of Power-Mixture Type |
title_fullStr |
Characterization of Probability Distributions via Functional Equations of Power-Mixture Type |
title_full_unstemmed |
Characterization of Probability Distributions via Functional Equations of Power-Mixture Type |
title_sort |
characterization of probability distributions via functional equations of power-mixture type |
publisher |
MDPI AG |
series |
Mathematics |
issn |
2227-7390 |
publishDate |
2021-01-01 |
description |
We study power-mixture type functional equations in terms of Laplace–Stieltjes transforms of probability distributions on the right half-line <inline-formula><math display="inline"><semantics><mrow><mo>[</mo><mn>0</mn><mo>,</mo><mi>∞</mi><mo>)</mo><mo>.</mo></mrow></semantics></math></inline-formula> These equations arise when studying distributional equations of the type <inline-formula><math display="inline"><semantics><mrow><mi>Z</mi><mover><mo>=</mo><mi mathvariant="normal">d</mi></mover><mi>X</mi><mo>+</mo><mi>T</mi><mi>Z</mi></mrow></semantics></math></inline-formula>, where the random variable <inline-formula><math display="inline"><semantics><mrow><mi>T</mi><mo>≥</mo><mn>0</mn></mrow></semantics></math></inline-formula> has known distribution, while the distribution of the random variable <inline-formula><math display="inline"><semantics><mrow><mi>Z</mi><mo>≥</mo><mn>0</mn></mrow></semantics></math></inline-formula> is a transformation of that of <inline-formula><math display="inline"><semantics><mrow><mi>X</mi><mo>≥</mo><mn>0</mn></mrow></semantics></math></inline-formula>, and we want to find the distribution of <i>X</i>. We provide necessary and sufficient conditions for such functional equations to have unique solutions. The uniqueness is equivalent to a characterization property of a probability distribution. We present results that are either new or extend and improve previous results about functional equations of compound-exponential and compound-Poisson types. In particular, we give another affirmative answer to a question posed by J. Pitman and M. Yor in 2003. We provide explicit illustrative examples and deal with related topics. |
topic |
distributional equation Laplace–Stieltjes transform Bernstein function power-mixture transform functional equation characterization of distributions |
url |
https://www.mdpi.com/2227-7390/9/3/271 |
work_keys_str_mv |
AT chinyuanhu characterizationofprobabilitydistributionsviafunctionalequationsofpowermixturetype AT gwodonglin characterizationofprobabilitydistributionsviafunctionalequationsofpowermixturetype AT jordanmstoyanov characterizationofprobabilitydistributionsviafunctionalequationsofpowermixturetype |
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1724318361003753472 |