Tiheysdiagrammi

Tiheysdiagrammi, often translated as density diagram or density plot, is a visualization tool used to display the distribution of a continuous variable. It is a smoothed version of a histogram and provides a more fluid representation of the data's shape. Unlike a histogram which bins data into discrete intervals, a density diagram uses a kernel density estimation to estimate the probability density function of the variable. This results in a smooth curve that shows where data points are concentrated and where they are sparse.

The primary purpose of a tiheysdiagrammi is to illustrate the underlying shape of the data, revealing patterns such as modality (number of peaks), skewness (asymmetry), and kurtosis (tailedness). It can be particularly useful when comparing the distributions of multiple groups or datasets on the same plot, allowing for easy visual assessment of similarities and differences. Common applications include exploratory data analysis, statistical modeling, and reporting in fields like statistics, machine learning, and data science. The smoothness of the curve can help to avoid the appearance of artifacts that might arise from arbitrary bin choices in a histogram, although the choice of kernel and bandwidth can influence the smoothness of the resulting curve.