# Why is TF IDF output lognormal?

I ran a TF IDF algorithm and the result of predicted similarities using cosine similarity is a log-normal distribution. Is this a feature of the algorithm (e.g., all logit probabilities are log-normal), or might it be a result in my data?

Thanks.

Let’s look at the formula used for the calculation of tf-idf scores
You can see a log with the idf term. The following answer explains this pretty well. log with idf