stm

stm is a skill for Claude Code, Codex from LeoLin990405/r-analytics-skill. It costs 21 tokens per session (1,059 once invoked), scanned A, original, MIT.

An R package for finding recurring themes in collections of documents and examining how those themes vary with document details such as year or party.

In plain words
What is it for?
Use it to prepare text, fit structural topic models, compare different topic counts, and inspect topic words and document-topic results.
Why use it?
It helps turn large text collections into measurable topics instead of requiring manual reading of every document.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to prepare text, fit structural topic models, compare different topic counts, and inspect topic words and document-topic results.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/leolin990405/r-analytics-skill/stm
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add LeoLin990405/r-analytics-skill --skill stm
Clone the repo
git clone --depth 1 https://github.com/LeoLin990405/r-analytics-skill

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for stm

README.md
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Your own site
<a href="https://agentmods.dev/skills/leolin990405/r-analytics-skill/stm"><img src="https://agentmods.dev/badge/skills/leolin990405/r-analytics-skill/stm/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for stm

Your own site · 80×15
<a href="https://agentmods.dev/skills/leolin990405/r-analytics-skill/stm"><img src="https://agentmods.dev/badge/skills/leolin990405/r-analytics-skill/stm.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 21 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,059 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00021 $0.01059
Opus 5 $0.00010 $0.00530
Sonnet 5 $0.00004 $0.00212
Haiku 4.5 $0.00002 $0.00106

Measured 9d ago against content hash 9aeb73ab4eb0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

stm scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

sub-skills/r-nlp/r-nlp-topic/stm/SKILL.md · 222 lines

How it starts

The opening of the file, as written. The whole thing — 222 lines — stays where its author put it; the contents beside it link to each section on GitHub.

stm

Structural Topic Models with covariates.

Basic Usage

library(stm)

# Prepare documents
processed <- textProcessor(texts, metadata = df)
out <- prepDocuments(processed$documents, processed$vocab, processed$meta)

# Fit STM
model <- stm(
  documents = out$documents,
  vocab = out$vocab,
  K = 10,  # Number of topics
  data = out$meta
)

With Covariates

# Topic prevalence varies by covariate
model <- stm(
  documents = out$documents,
  vocab = out$vocab,
  K = 10,
  prevalence = ~ party + s(year),  # Topic prevalence formula
  data = out$meta
)

# Topic content varies by covariate
model <- stm(
  documents = out$documents,
  vocab = out$vocab,
  K = 10,
  content = ~ party,  # Topic content formula
  data = out$meta
)

# Both
model <- stm(
  documents = out$documents,
  vocab = out$vocab,
  K = 10,
  prevalence = ~ party + s(year),
  content = ~ party,
  data = out$meta
)

Model Selection

# Search for optimal K
search_result <- searchK(
  out$documents,
  out$vocab,
  K = c(5, 10, 15, 20),
  data = out$meta,
  prevalence = ~ party
)

# Plot diagnostics
plot(search_result)

Extract Results

# Top words per topic
labelTopics(model)

# FREX words (frequent and exclusive)
labelTopics(model, frexweight = 0.5)

# Topic proportions
model$theta

# Word-topic probabilities
model$beta

Visualization

# Topic quality
topicQuality(model, out$documents)

# Topic correlation
topicCorr(model)
plot(topicCorr(model))

# Word cloud
cloud(model, topic = 1)

# Topic prevalence
plot(model, type = "summary")

# Topic labels
plot(model, type = "labels")

# Perspectives (compare topics)
plot(model, type = "perspectives", topics = c(1, 2))

Covariate Effects

# Estimate effect of covariates
effect <- estimateEffect(
  formula = 1:10 ~ party + s(year),
  stmobj = model,
  metadata = out$meta
)

# Plot effect
plot(effect, covariate = "party", topics = 1:5,
     model = model, method = "difference",
     cov.value1 = "Democrat", cov.value2 = "Republican")

# Continuous covariate
plot(effect, covariate = "year", topics = 1,
     model = model, method = "continuous")

Read the full file on GitHub · 222 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 222 lines · 21 tokens per session scan A 9aeb73ab4eb0

Subscribe to this mod's changes

stm is a skill published in the GitHub repository LeoLin990405/r-analytics-skill (5 stars, last pushed 6mo ago), licensed MIT. It adds 21 tokens to every session and 1,059 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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