Data & Methodology

Data sources, definitions, and methodology behind NationalSummary.com statistics.

U.S. GDP Deflator vs. CPI: How Inflation Measures Differ and Why It Matters

| Data & Methodology |

The Consumer Price Index (CPI) and the GDP deflator are both measures of inflation, but they track different baskets and scopes. The CPI measures prices paid by urban consumers for a fixed basket including imports, while the GDP deflator measures prices of all domestic production with a changing basket. Since the early 1970s, the CPI has risen almost 30% more than the GDP deflator, a gap that matters for cost-of-living adjustments and real GDP.

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Where National Summary Gets Its Data

| Data Sources |

National Summary relies exclusively on official, publicly documented U.S. data sources. The publication’s core data pipeline draws from NOAA’s Global Summary of the Month for climate, the Bureau of Labor Statistics’ Current Employment Statistics for jobs, and the National Interagency Coordination Center’s Incident Management Situation Report for wildfire activity. This article explains how those sources work, how often they are updated, and why their documentation matters.

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How to Read U.S. Government Statistics: A Practical Guide to Official Data

| Data & Methodology |

U.S. government statistics shape policy, markets, and public understanding, but they are not raw truths. They are estimates built from surveys, administrative records, and complex methodologies that require careful interpretation. This guide explains where federal data comes from, how to read key releases such as the BLS jobs report and CPI, and how to spot common pitfalls in economic charts.

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