Evo Business Cycle

Community

Zhang-Henry

evo-business-cycle

Calculate Pearson correlation between HP-filtered cyclical components of real PCE and real PFI from ERP tables and CPI data. Use when detrending macroeconomic time series and computing business cycle correlations.

Overview

Publisher	Zhang-Henry
Repository	`CoEvoSkills`
Skill name	`evo-business-cycle`
Stars	83
Forks	9
Bundled files	1
License	Apache-2.0
Links	Skill source Repository Homepage

Markdown instructions
A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.
Works with any LLM
AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.
1 bundled files
Scripts, templates, and references the model can read while it works. Files are read-only and never executed.
Open source
Published by Zhang-Henry on GitHub. Read the source before you install it.

Installation

Install the Evo Business Cycle AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
https://github.com/Zhang-Henry/CoEvoSkills/tree/main/artifacts/skills/econ-detrending-correlation/evo-business-cycle
Enable the skill in any chat where you want it available.

Store

Installed

Skills

Add skills

Import one or more skills from a public GitHub folder or a local .skill or .zip archive, or SKILL.md file.

From GitHub URLFrom .skill, .zip, or SKILL.md

GitHub repo or folder

https://github.com/Zhang-Henry/CoEvoSkills/tree/main/artifacts/skills/econ-detrending-correlation/evo-business-cycle

Points to a single skill folder, or any folder that contains multiple skills. Public repos only.

CancelContinue

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills

git clone --depth 1 https://github.com/Zhang-Henry/CoEvoSkills.git /tmp/CoEvoSkills
mkdir -p .claude/skills
cp -r /tmp/CoEvoSkills/artifacts/skills/econ-detrending-correlation/evo-business-cycle .claude/skills/evo-business-cycle

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Evo Business Cycle in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Evo Business Cycle on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Evo Business Cycle is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

Loaded only when it is needed
The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.
Switch models mid-chat
Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

Business Cycle Correlation Skill

This skill extracts nominal PCE and PFI from ERP Excel tables, deflates them using a CPI index, applies the Hodrick-Prescott filter on log-transformed real series, and computes the Pearson correlation of the cyclical components.

Workflow

Parse ERP .xls tables to extract annual totals (column 1)
For years with only quarterly data, average available quarters
Deflate nominal series using CPI (real = nominal / CPI)
Take natural logarithm of real series
Apply HP filter with specified lambda (100 for annual data)
Compute Pearson correlation of cyclical components
Write rounded result to output file

Usage Example

python
import sys
sys.path.insert(0, '/app/environment/skills/evo-business-cycle/scripts')
from utils import run_business_cycle_correlation, validate_result

# Run end-to-end
corr = run_business_cycle_correlation(
    pce_filepath='/root/ERP-2025-table10.xls',
    pfi_filepath='/root/ERP-2025-table12.xls',
    cpi_filepath='/root/CPI.xlsx',
    output_filepath='/root/answer.txt',
    start_year=1973,
    end_year=2024,
    hp_lambda=100,
    decimals=5
)

# Validate
validate_result('/root/answer.txt')

Key Functions

extract_erp_annual_data(filepath, data_start_row, col_index) - Parse annual rows from ERP tables
extract_erp_quarterly_for_year(filepath, target_year, data_start_row, col_index) - Get quarterly values for a specific year
load_cpi(filepath) - Load CPI data from xlsx
deflate_series(nominal_dict, cpi_dict) - Convert nominal to real values
hp_filter(series_values, lamb) - Apply HP filter, returns (cycle, trend)
compute_correlation(series1, series2) - Pearson correlation
run_business_cycle_correlation(...) - End-to-end entry point
validate_result(output_filepath) - Validate output file

Bundled files

The model reads these on demand while the skill is loaded. They are exposed as readable files and are never executed.

scripts/utils.py8 KB

Frequently asked questions

What does the Evo Business Cycle AI skill do?

Why use Evo Business Cycle on TypingMind?

Because you install it once and use it with any model. Evo Business Cycle is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Evo Business Cycle in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/Zhang-Henry/CoEvoSkills/tree/main/artifacts/skills/econ-detrending-correlation/evo-business-cycle. TypingMind reads its SKILL.md and bundles its files and installs it as a skill you can enable per chat.

Which AI models can use Evo Business Cycle?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Evo Business Cycle?

As many as you like. As long as a model supports skills, you can use Evo Business Cycle with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Evo Business Cycle AI skill free?

Yes. It is published on GitHub by Zhang-Henry under the Apache-2.0 license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

Business Cycle Correlation Skill

Workflow

Usage Example

Key Functions

Bundled files

Frequently asked questions

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