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asharechips

asharechips estimates daily holding-cost distributions for mainland Chinese A-share equities. It provides offline preparation of Tushare tables, explicit turnover-replacement models, optional price adjustment and initial distributions, cost statistics, graphics and per-day diagnostics. The estimates describe a model of circulating shares; they do not identify actual investors.

The package needs only base R and the recommended graphics package at runtime. No token, network access or external data is needed for its examples or tests.

中文入门说明：筹码分布模型与使用方法。

Installation

Install the development version from GitHub:

install.packages("remotes")  # Needed only for installation from GitHub
remotes::install_github("3142115360-web/asharechips", build_vignettes = TRUE)
library(asharechips)

Alternatively, install a locally built source archive:

install.packages("asharechips_0.2.1.tar.gz", repos = NULL, type = "source")
library(asharechips)

A reproducible example

# Synthetic prices and turnover; this is not a real stock history.
daily <- data.frame(
  trade_date = c("20260106", "20260102", "20260105"),
  high = c(12, 10, 11), low = c(12, 10, 11), close = c(12, 10, 11),
  vol = c(100, 100, 100), amount = c(120, 100, 110),
  turnover_rate = c(30, 0, 20)
)
chips <- estimate_chip_distribution(daily)
summary(chips)
as.data.frame(chips)
plot(chips, main = "Synthetic cost distribution")
chip_mean_cost(c(10, 11, 12), c(50, 20, 30))

Preparing Tushare data

Download daily, daily_basic and optionally adj_factor through your own Tushare account. Supply those tables locally:

input <- prepare_tushare_data(daily, daily_basic, adj_factor,
                             ts_code = "000001.SZ", as_of = "20260930")
chips <- estimate_chip_distribution(input, adjustment_col = "adj_factor")

This code assumes that the three tables have already been downloaded. All retained daily dates must have matching indicators and factors. No daily rows are silently lost. When passing factors, use original unadjusted daily prices.

The default transaction price is amount * 10 / vol, following the official daily-data units. The turnover denominator follows Tushare’s daily indicator definition.

The model

At each update, the distribution is the sum of retained previous weight and new transaction weight. With reported turnover r in percentage points:

retention = exp(-r / 100)             # default
new distribution = retention * old distribution
                 + (1 - retention) * today's price distribution

The exponential choice is a homogeneous random-replacement assumption. The linear choice retains 1 - r / 100 and requires r <= 100. New weight can be placed at VWAP, a typical price, close, or uniformly across the low-high range. Grid spacing, transaction-price method and history length change the result.

The default initializes all shares from the first row, then updates from row two. A supplied initial_distribution must be on the final date’s price basis and is updated starting with row one. initialization_weight reports how much of that initial model survives, while history_coverage reports its replacement.

Profitable weight is strictly below the final close. Equal-price weight is reported separately as breakeven_ratio. Cost quantiles are discrete left-inverse quantiles. Tied peaks use the lowest price. These definitions are documented in ?estimate_chip_distribution, along with every output field.

Limits

Daily data cannot reveal which holdings were sold, intraday transaction-price distributions, investor identities or the costs of newly unlocked or issued shares. Changes to float_share trigger a warning; they are not automatically modelled. Dividend adjustment provides a comparable price basis rather than literal cash acquisition costs. Transaction fees and taxes are excluded. The estimates are descriptive and do not predict future returns.

Documentation and development

vignette("introduction", package = "asharechips")

Chinese guidance is installed as system.file("README.zh-CN.md", package = "asharechips"). Help files in man/ are maintained directly rather than generated from roxygen comments. To reproduce checks:

R CMD build asharechips
R CMD check --as-cran asharechips_0.2.1.tar.gz

The repository includes a Windows, macOS, Linux and R-devel check workflow. Results appear under the repository’s Actions tab after each push.

The workflow’s presence alone does not mean that every check has passed; inspect the individual jobs and their logs before relying on a release candidate.

License

MIT, copyright Ruihong Zhao. See inst/LICENSE.txt for the full text. The R package license metadata is in LICENSE; the full license is also installed as LICENSE.txt.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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