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Unified PPC/PPD interface via observed argument

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5/5
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一周以上
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25/100
Issue 类型
功能
描述清晰度
需要澄清
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停滞
技术栈
r

调研方向

首先审查现有的 ppc_* 和 ppd_* 函数族,以及 Issue #433 中相关的统一化提案。确定共享接口的范围,包括应如何处理观测数据和现有函数名。完成的标准是达成一致且一致的 API 设计,并明确规定其迁移影响。

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描述

feature

Summary

bayesplot currently maintains two parallel function families:

  • ppc_* functions: Compare predictive draws against observed data y.
  • ppd_* functions: Display predictive draws without observed data.

Conceptually, these families seem to be similar except for the inclusion of y. Maintaining two separate namespaces can make it harder for new users to navigate the package and understand the distinction between the two modules.

Proposed Change

Introduce a unified top-level interface where the presence or absence of observed data is controlled by an additional argument (e.g., observed):

# With observed data (PPC)
pp_dens(y, yrep, observed = TRUE, ...)

# Without observed data (PPD)
pp_dens(yrep = yrep, observed = FALSE, ...)

Relationship to Other Issues

This proposal is related to Issue#433, as both aim to unify the API through high-level wrapper functions. However, while Issue#433 focuses on unifying functions within a specific family (e.g., distributions, intervals, errors), this issue addresses the broader relationship between the PPC and PPD modules.

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