From 96b84b68d7426641dc776175531be8968c56ccfd Mon Sep 17 00:00:00 2001 From: John Vincent Cauilan <64677361+johvincau@users.noreply.github.com> Date: Tue, 16 Jul 2024 16:59:16 -0500 Subject: [PATCH] Include batch statistics discussion in methodology introduction (#3076) Co-authored-by: Paul Romano --- docs/source/methods/tallies.rst | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/docs/source/methods/tallies.rst b/docs/source/methods/tallies.rst index d833c157d5d..4b56d39559a 100644 --- a/docs/source/methods/tallies.rst +++ b/docs/source/methods/tallies.rst @@ -4,9 +4,9 @@ Tallies ======= -Note that the methods discussed in this section are written specifically for -continuous-energy mode but equivalent apply to the multi-group mode if the -particle's energy is replaced with the particle's group +The methods discussed in this section are written specifically for continuous- +energy mode. However, they can also apply to the multi-group mode if the +particle's energy is instead interpreted as the particle's group. ------------------ Filters and Scores @@ -207,6 +207,8 @@ the change-in-angle), we must use an analog estimator. .. TODO: Add description of surface current tallies +.. _tallies_statistics: + ---------- Statistics ---------- @@ -268,6 +270,14 @@ normal, log-normal, Weibull, etc. The central limit theorem states that as Estimating Statistics of a Random Variable ------------------------------------------ +After running OpenMC, each tallied quantity has a reported mean and standard +deviation. The below sections explain how these quantities are computed. Note +that OpenMC uses **batch statistics**, meaning that each observation for a tally +random variable corresponds to the aggregation of tally contributions from +multiple source particles that are grouped together into a single batch. See +:ref:`usersguide_particles` for more information on how the number of source +particles and statistical batches are specified. + Mean ++++