GEH Statistic

Imagine you're counting cars on a street. The GEH statistic is like a special math tool that helps grown-ups compare how many cars they expected to see with how many they actually saw. It’s named after a clever person named Geoffrey E.

Havers who invented it a long, long time ago. It helps make sure our traffic plans are super accurate, like making sure there are enough buses for everyone at school!

This special counting helper was invented in the 1970s by Geoffrey E. Havers. He was working in London, England, trying to figure out the best ways to move people around. He wanted a way to check if his car-counting predictions were right. It’s not exactly like a science experiment, but it’s a super useful trick that engineers still use today to check their work.

Think about a big highway with tons of cars, and then a tiny little street with only a few. Using simple percentages to compare them doesn't work very well! The GEH statistic is like a superhero that can handle both big and small numbers. It helps engineers know if their traffic plans are good, making sure roads aren't too crowded or too empty. This means smoother car rides for everyone!

The GEH statistic uses a special math formula. It takes the number of cars you thought would be there and compares it to the number of cars you actually saw. If the numbers are very close, the GEH number is small.

If the numbers are very different, the GEH number is bigger. If the GEH number is small (less than 5), it means the traffic plan is probably right! If it's too big, it means something needs to be checked.