HELPERG Data · Guides
Data guides
Short, sourced explanations for reading the data HELPERG serves: hourly weather forecasts, weather forecasts versus observations, CPI versus PPI, and revisions to official figures.
Weather
The weather on HELPERG is MET Norway’s model output for a point, served as it is published.
How to read an hourly weather forecast
Which values describe an instant and which describe the hour that follows, what m/s, mm and hPa mean, and the common misreadings.
Weather forecast vs observations: what a model value is, and is not
Model output against measurements: what each represents, why they disagree, and how to compare them fairly.
Economic data
Official statistics from BLS, Eurostat and the ECB, with the time each figure was published and any value it replaced.
CPI vs PPI: what each index measures, and monthly versus 12-month change
Buyer’s and seller’s view of prices, what each index includes, and a worked monthly and 12-month change.
Preliminary values and revisions: why a published economic figure can change
Why official figures are revised, the BLS and Eurostat schedules for CPI, PPI and GDP, and how a revision appears on HELPERG.