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add yule_simon_lccdf by lingium · Pull Request #3236 · stan-dev/math · GitHub

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add yule_simon_lccdf - #3236

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lingium merged 3 commits into
stan-dev:developfrom
lingium:feature/issue-3235-yule-simon-lccdf
Oct 7, 2025
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add yule_simon_lccdf#3236
lingium merged 3 commits into
stan-dev:developfrom
lingium:feature/issue-3235-yule-simon-lccdf

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lingium commented Sep 15, 2025

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Summary

With this PR the lccdf of Yule Simon distribution is added.
See issue #3235

Expressions involved:

$$ \begin{align} & P(Y \leq y) = F(y,\alpha) = 1-C(y,\alpha) = 1-\frac{\Gamma (\alpha+1) \Gamma(y +1) }{\Gamma (\alpha+y+1)}, \quad y=1,2,... \quad \alpha>0 \end{align} $$

$C(y,\alpha)$ is the ccdf.

Derivatives w.r.t the parameter

$$ \begin{align} \frac{\partial \log C(y,\alpha)}{\partial \alpha} &= \psi(\alpha+1) - \psi(\alpha+y+1) \end{align} $$

Tests

Test is written follow the guide.

Side Effects

No.

Release notes

yule_simon_lccdf is available if merged. Allows modeling power-law count data.

Checklist

  • Copyright holder: Zhi Ling

    The copyright holder is typically you or your assignee, such as a university or company. By submitting this pull request, the copyright holder is agreeing to the license the submitted work under the following licenses:
    - Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
    - Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

  • the basic tests are passing

    • unit tests pass (to run, use: ./runTests.py test/unit)
    • header checks pass, (make test-headers)
    • dependencies checks pass, (make test-math-dependencies)
    • docs build, (make doxygen)
    • code passes the built in C++ standards checks (make cpplint)

  • the code is written in idiomatic C++ and changes are documented in the doxygen

  • the new changes are tested

stan-buildbot commented Sep 15, 2025

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Name Old Result New Result Ratio Performance change( 1 - new / old )
arma/arma.stan 0.32 0.31 1.05 4.8% faster
low_dim_corr_gauss/low_dim_corr_gauss.stan 0.01 0.01 1.09 7.94% faster
gp_regr/gen_gp_data.stan 0.03 0.04 0.67 -48.62% slower
gp_regr/gp_regr.stan 0.1 0.09 1.1 9.26% faster
sir/sir.stan 72.99 68.02 1.07 6.81% faster
irt_2pl/irt_2pl.stan 4.2 3.87 1.08 7.8% faster
eight_schools/eight_schools.stan 0.06 0.05 1.07 6.6% faster
pkpd/sim_one_comp_mm_elim_abs.stan 0.25 0.24 1.06 5.74% faster
pkpd/one_comp_mm_elim_abs.stan 19.63 18.44 1.06 6.03% faster
garch/garch.stan 0.44 0.4 1.08 7.43% faster
low_dim_gauss_mix/low_dim_gauss_mix.stan 2.73 2.56 1.07 6.27% faster
arK/arK.stan 1.83 1.73 1.06 5.49% faster
gp_pois_regr/gp_pois_regr.stan 2.94 2.69 1.09 8.65% faster
low_dim_gauss_mix_collapse/low_dim_gauss_mix_collapse.stan 8.68 8.4 1.03 3.26% faster
performance.compilation 178.5 178.16 1.0 0.19% faster
Mean result: 1.0400329749930215

Jenkins Console Log
Blue Ocean
Commit hash: 32a46e67d86591e8bb68b35e5a90ca3ae7c9f424

Machine information No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.3 LTS Release: 20.04 Codename: focal

CPU:
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
Address sizes: 46 bits physical, 48 bits virtual
CPU(s): 80
On-line CPU(s) list: 0-79
Thread(s) per core: 2
Core(s) per socket: 20
Socket(s): 2
NUMA node(s): 2
Vendor ID: GenuineIntel
CPU family: 6
Model: 85
Model name: Intel(R) Xeon(R) Gold 6148 CPU @ 2.40GHz
Stepping: 4
CPU MHz: 2733.418
CPU max MHz: 3700.0000
CPU min MHz: 1000.0000
BogoMIPS: 4800.00
Virtualization: VT-x
L1d cache: 1.3 MiB
L1i cache: 1.3 MiB
L2 cache: 40 MiB
L3 cache: 55 MiB
NUMA node0 CPU(s): 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78
NUMA node1 CPU(s): 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53,55,57,59,61,63,65,67,69,71,73,75,77,79
Vulnerability Gather data sampling: Mitigation; Microcode
Vulnerability Itlb multihit: KVM: Mitigation: VMX disabled
Vulnerability L1tf: Mitigation; PTE Inversion; VMX conditional cache flushes, SMT vulnerable
Vulnerability Mds: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Meltdown: Mitigation; PTI
Vulnerability Mmio stale data: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Reg file data sampling: Not affected
Vulnerability Retbleed: Mitigation; IBRS
Vulnerability Spec rstack overflow: Not affected
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2: Mitigation; IBRS; IBPB conditional; STIBP conditional; RSB filling; PBRSB-eIBRS Not affected; BHI Not affected
Vulnerability Srbds: Not affected
Vulnerability Tsx async abort: Mitigation; Clear CPU buffers; SMT vulnerable
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 cdp_l3 invpcid_single pti intel_ppin ssbd mba ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm mpx rdt_a avx512f avx512dq rdseed adx smap clflushopt clwb intel_pt avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts hwp hwp_act_window hwp_epp hwp_pkg_req pku ospke md_clear flush_l1d arch_capabilities

G++:
g++ (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Clang:
clang version 10.0.0-4ubuntu1
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

SteveBronder previously approved these changes Sep 23, 2025
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

One small change but I think this is good to merge as is

Comment thread stan/math/prim/prob/yule_simon_lccdf.hpp Outdated
Update stan/math/prim/prob/yule_simon_lccdf.hpp
72d4ba8 
Co-authored-by: Steve Bronder <Stevo15025@gmail.com>

stan-buildbot commented Sep 26, 2025

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Name Old Result New Result Ratio Performance change( 1 - new / old )
arma/arma.stan 0.39 0.33 1.19 15.83% faster
low_dim_corr_gauss/low_dim_corr_gauss.stan 0.01 0.01 0.94 -5.85% slower
gp_regr/gen_gp_data.stan 0.02 0.03 0.76 -31.77% slower
gp_regr/gp_regr.stan 0.1 0.1 1.01 1.02% faster
sir/sir.stan 81.97 73.38 1.12 10.48% faster
irt_2pl/irt_2pl.stan 5.18 4.26 1.22 17.87% faster
eight_schools/eight_schools.stan 0.07 0.06 1.25 19.97% faster
pkpd/sim_one_comp_mm_elim_abs.stan 0.29 0.26 1.08 7.74% faster
pkpd/one_comp_mm_elim_abs.stan 22.46 19.84 1.13 11.64% faster
garch/garch.stan 0.53 0.46 1.17 14.78% faster
low_dim_gauss_mix/low_dim_gauss_mix.stan 3.07 2.76 1.11 10.03% faster
arK/arK.stan 1.96 1.85 1.06 5.36% faster
gp_pois_regr/gp_pois_regr.stan 3.07 2.91 1.05 5.1% faster
low_dim_gauss_mix_collapse/low_dim_gauss_mix_collapse.stan 9.57 9.1 1.05 4.97% faster
performance.compilation 224.84 217.02 1.04 3.47% faster
Mean result: 1.0790413833264176

Jenkins Console Log
Blue Ocean
Commit hash: ab0b7021ea9509b9bf50dd771c7d9c38dcac690c

Machine information No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.3 LTS Release: 20.04 Codename: focal

CPU:
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
Address sizes: 46 bits physical, 48 bits virtual
CPU(s): 80
On-line CPU(s) list: 0-79
Thread(s) per core: 2
Core(s) per socket: 20
Socket(s): 2
NUMA node(s): 2
Vendor ID: GenuineIntel
CPU family: 6
Model: 85
Model name: Intel(R) Xeon(R) Gold 6148 CPU @ 2.40GHz
Stepping: 4
CPU MHz: 2400.000
CPU max MHz: 3700.0000
CPU min MHz: 1000.0000
BogoMIPS: 4800.00
Virtualization: VT-x
L1d cache: 1.3 MiB
L1i cache: 1.3 MiB
L2 cache: 40 MiB
L3 cache: 55 MiB
NUMA node0 CPU(s): 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78
NUMA node1 CPU(s): 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53,55,57,59,61,63,65,67,69,71,73,75,77,79
Vulnerability Gather data sampling: Mitigation; Microcode
Vulnerability Itlb multihit: KVM: Mitigation: VMX disabled
Vulnerability L1tf: Mitigation; PTE Inversion; VMX conditional cache flushes, SMT vulnerable
Vulnerability Mds: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Meltdown: Mitigation; PTI
Vulnerability Mmio stale data: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Reg file data sampling: Not affected
Vulnerability Retbleed: Mitigation; IBRS
Vulnerability Spec rstack overflow: Not affected
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2: Mitigation; IBRS; IBPB conditional; STIBP conditional; RSB filling; PBRSB-eIBRS Not affected; BHI Not affected
Vulnerability Srbds: Not affected
Vulnerability Tsx async abort: Mitigation; Clear CPU buffers; SMT vulnerable
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 cdp_l3 invpcid_single pti intel_ppin ssbd mba ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm mpx rdt_a avx512f avx512dq rdseed adx smap clflushopt clwb intel_pt avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts hwp hwp_act_window hwp_epp hwp_pkg_req pku ospke md_clear flush_l1d arch_capabilities

G++:
g++ (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Clang:
clang version 10.0.0-4ubuntu1
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

SteveBronder previously approved these changes Oct 3, 2025
View reviewed changes

SteveBronder left a comment

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Two small things that would be nice but are non-blocking. Otherwise good!

Comment thread stan/math/prim/prob/yule_simon_lccdf.hpp Outdated
Comment thread stan/math/prim/prob/yule_simon_lccdf.hpp
Update stan/math/prim/prob/yule_simon_lccdf.hpp
94dda8f 
Co-authored-by: Steve Bronder <Stevo15025@gmail.com>

stan-buildbot commented Oct 4, 2025

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Name Old Result New Result Ratio Performance change( 1 - new / old )
arma/arma.stan 0.4 0.4 0.99 -1.45% slower
low_dim_corr_gauss/low_dim_corr_gauss.stan 0.01 0.01 1.07 6.77% faster
gp_regr/gen_gp_data.stan 0.03 0.02 1.1 9.29% faster
gp_regr/gp_regr.stan 0.1 0.1 1.04 4.28% faster
sir/sir.stan 74.68 72.3 1.03 3.2% faster
irt_2pl/irt_2pl.stan 4.63 4.26 1.09 7.98% faster
eight_schools/eight_schools.stan 0.06 0.06 1.04 4.08% faster
pkpd/sim_one_comp_mm_elim_abs.stan 0.26 0.26 1.03 2.46% faster
pkpd/one_comp_mm_elim_abs.stan 20.16 19.63 1.03 2.64% faster
garch/garch.stan 0.5 0.44 1.13 11.33% faster
low_dim_gauss_mix/low_dim_gauss_mix.stan 2.81 2.73 1.03 2.9% faster
arK/arK.stan 1.86 1.86 1.0 -0.4% slower
gp_pois_regr/gp_pois_regr.stan 2.93 2.89 1.01 1.23% faster
low_dim_gauss_mix_collapse/low_dim_gauss_mix_collapse.stan 9.25 9.1 1.02 1.62% faster
performance.compilation 192.54 191.68 1.0 0.44% faster
Mean result: 1.040471131650069

Jenkins Console Log
Blue Ocean
Commit hash: e4209047880771b486dfe532503f536918e27083

Machine information No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.3 LTS Release: 20.04 Codename: focal

CPU:
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
Address sizes: 46 bits physical, 48 bits virtual
CPU(s): 80
On-line CPU(s) list: 0-79
Thread(s) per core: 2
Core(s) per socket: 20
Socket(s): 2
NUMA node(s): 2
Vendor ID: GenuineIntel
CPU family: 6
Model: 85
Model name: Intel(R) Xeon(R) Gold 6148 CPU @ 2.40GHz
Stepping: 4
CPU MHz: 2400.000
CPU max MHz: 3700.0000
CPU min MHz: 1000.0000
BogoMIPS: 4800.00
Virtualization: VT-x
L1d cache: 1.3 MiB
L1i cache: 1.3 MiB
L2 cache: 40 MiB
L3 cache: 55 MiB
NUMA node0 CPU(s): 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78
NUMA node1 CPU(s): 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53,55,57,59,61,63,65,67,69,71,73,75,77,79
Vulnerability Gather data sampling: Mitigation; Microcode
Vulnerability Itlb multihit: KVM: Mitigation: VMX disabled
Vulnerability L1tf: Mitigation; PTE Inversion; VMX conditional cache flushes, SMT vulnerable
Vulnerability Mds: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Meltdown: Mitigation; PTI
Vulnerability Mmio stale data: Mitigation; Clear CPU buffers; SMT vulnerable
Vulnerability Reg file data sampling: Not affected
Vulnerability Retbleed: Mitigation; IBRS
Vulnerability Spec rstack overflow: Not affected
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2: Mitigation; IBRS; IBPB conditional; STIBP conditional; RSB filling; PBRSB-eIBRS Not affected; BHI Not affected
Vulnerability Srbds: Not affected
Vulnerability Tsx async abort: Mitigation; Clear CPU buffers; SMT vulnerable
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 cdp_l3 invpcid_single pti intel_ppin ssbd mba ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm mpx rdt_a avx512f avx512dq rdseed adx smap clflushopt clwb intel_pt avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts hwp hwp_act_window hwp_epp hwp_pkg_req pku ospke md_clear flush_l1d arch_capabilities

G++:
g++ (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Clang:
clang version 10.0.0-4ubuntu1
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

lingium merged commit 407dcfe into stan-dev:develop Oct 7, 2025
34 checks passed

lingium commented Oct 7, 2025

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Thanks!

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