Statistics is used everything and is something you don't want to miss..
# Statistics

# What is a fit?

A fit is a procedure to find minimum/maximum of a certain metric.
## Best Fit Interpretation

### Overconstrain/Underconstrain

## Technical procedure of minimization

### Examples of metrics

The current error are given as 1sigma deviation, due to convention. So nuisance parameter are usually assigned to a Gaussian constraint with sigma=1. If the estimated error given by fitting algorithms is less than 1, we have underconstrain. If it's over 1, we have overconstrain.

The estimated errors given by the the fitting algorithm are what the algorithm defines 1sigma error. So if you have underconstrain, for example 0.9, the algorithm thought your error should be 0.9 * variation_1sigma, so you have overestimated your error

-- RongkunWang - 2017-09-04

Topic revision: r1 - 2017-09-04 - RongkunWang

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