statistical-analysis

Analyze numerical datasets to produce descriptive statistics, outlier flags, and trend forecasts.

Updated Apr 16, 2026
One-click install
npx skills add https://github.com/yethikrishna/humble --skill statistical-analysis-yethikrishna
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: statistical-analysis
Source: https://github.com/yethikrishna/humble/tree/main/core/kortix-master/opencode/skills/GENERAL-KNOWLEDGE-WORKER/statistical-analysis
Command: npx skills add https://github.com/yethikrishna/humble --skill statistical-analysis-yethikrishna

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Provides practical, business-focused statistical guidance to summarize metrics, detect anomalies, evaluate trends, and avoid common misinterpretations so stakeholders can make informed decisions without overclaiming certainty.

Core Features & Use Cases

  • Descriptive summaries: Recommend mean, median, IQR, standard deviation, coefficient of variation, and key percentiles to characterize distributions.
  • Trend analysis & forecasting: Explain moving averages, period-over-period comparisons, simple naive and seasonal forecasts, and when to escalate to advanced modeling.
  • Outlier and anomaly detection: Present z-score, IQR, and percentile methods for point anomalies and residual-based approaches for time series anomalies.
  • Hypothesis testing guidance: Advise on test selection (t-test, proportions, ANOVA, nonparametric), significance versus practical importance, confidence intervals, and sample size considerations.
  • Use case: Rapidly assess whether a change in conversion rate or session duration is meaningful, identify extreme users, and produce actionable summaries for product or marketing teams.

Quick Start

Analyze the attached dataset and report mean, median, IQR, p50/p75/p90/p95, flag outliers, show a 7-day moving average for trends, and state whether results warrant escalation to a data scientist.

Frequently Asked Questions about statistical-analysis

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I calculate descriptive statistics and percentiles for a business metrics dataset?

Calculate descriptive statistics by computing mean, median, IQR, standard deviation, and key percentiles to characterize distributions. This provides central tendency and spread measures to summarize business metrics and identify normal operational ranges.

What is the best way to detect outliers and anomalies in time series data?

Detect outliers in time series data using z-score, IQR, and percentile methods for point anomalies, or residual-based approaches for time series anomalies. These techniques flag extreme users and unexpected metric shifts for product or marketing analysis.

How do I run hypothesis testing for A/B test summaries to check if conversion rate changes are meaningful?

Run hypothesis testing for A/B test summaries by selecting appropriate tests like t-tests or proportions tests, evaluating significance versus practical importance, and checking confidence intervals. This determines whether conversion rate changes warrant escalation to data scientists.

Can I use simple forecasting and trend analysis for small-to-medium datasets?

Yes, you can apply simple forecasting and trend analysis to small-to-medium datasets using moving averages and period-over-period comparisons. This produces basic forecasts and identifies trends while advising when to escalate to advanced modeling.

When should I escalate anomaly detection results to a data scientist?

Escalate anomaly detection results to a data scientist when flagged outliers require advanced modeling, or when hypothesis test recommendations and sample size considerations indicate that simple naive or seasonal forecasts are insufficient for accurate trend evaluation.