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trend-analysis

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Detect long-term trends in time series data using parametric and non-parametric methods. Use when determining if a variable shows statistically significant increase or decrease over time.

tasks/lake-warming-attribution/environment/skills/trend-analysis/SKILL.md

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# Trend Analysis Guide

## Overview

Trend analysis determines whether a time series shows a statistically significant long-term increase or decrease. This guide covers both parametric (linear regression) and non-parametric (Sen's slope) methods.

## Parametric Method: Linear Regression

Linear regression fits a straight line to the data and tests if the slope is significantly different from zero.
```python
from scipy import stats

slope, intercept, r_value, p_value, std_err = stats.linregress(years, values)