## How Probability Calibration Works

Probability calibration is the process of calibrating an ML model to return the true likelihood of an event. This is necessary when we need the probability of the event in question rather than its classification.

Image that you have two models to predict rainy days, Model A and Model B. Both models have an accuracy of 0.8. And indeed, for every 10 rainy days, both mislabelled two days.
But if we look at the probability connected to each prediction, we can see that Model A reports a probability of 80%, while Model B of 100%.

This means that model B is 100% sure that it will rain, even when it will not, while model A is only 80% sure. It appears that model B is overconfident with its prediction, while model A is more cautious.

And it’s this level of confidence in predictions that makes Model A a more reliable model with respect to Model B; Model A is better despite the two models having the same accuracy.

Model B offers a more yes-or-no prediction, while Model A tells us the true likelihood of the event. And in real life, when we look at the weather forecast, we get the prediction and its probability, leaving us to decide if, for example, a 30% risk of rain is acceptable or not.

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## Create a weather forecast model with ML

How to create a simple weather forecast model using ML and how to find public available weather data with ERA5!

As a data scientist at Intellegens, I work on a plethora of different projects for different industries including materials, drug design, and chemicals. For one particular project looking I was in desperate need of weather data. I needed things like, temperature, humidity, rainfall, etc. Given the spacetime coordinates (date, time and GPS location). And this made me fall into a rabbit hole so deep, that I decided to share it with you!

## Weather Data

I thought that finding an API that could give this type of information was going to be easy. I didn’t foresee weather data to be one of the most jealously kept types of data.

If you search for “free weather API”, you will see plenty of similar websites with different services but not actually free and even if there is a free package, it will never have historical weather records.You really need to search hard before finding the Climate Data Store (CDS) web site.

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