A dendrogram is a graphical representation that allows you to clearly visualize the relationships between data groups and even between subgroups, even if there is no similarity or closeness between the categories. These diagrams are ideal for: biology, marketing campaigns, business analysis, and so on. For this reason, we will present four web pages to generate dendrograms in a simple way.
For those who don't know what a dendrogram is, here's a brief explanation: “A dendrogram is a type of graphical representation or tree-shaped data diagram that organizes data into subcategories that are further divided into others, until reaching the desired level of detail (resembling the branches of a tree that keep dividing into other branches successively).” Let's see here some online creators so you can make them without too much work.
HeatMapper
HeatMapper is an online platform that allows you to create heat maps. With its “Expression Heat Map” tool you can perform hierarchical clustering of your data and generate a dendrogram along with a heat map. You can load data in formats: CSV, TXT, DAT, TSV, TAB, XLS or XLSX. Then you will have to choose among four grouping schemes (Average Linkage - Centroid Linkage - Complete Linkage - Single Linkage), and you can export the chart in PDF, JPEG, PNG or TIFF format.
DendroUPGMA
DendroUPGMA allows you to easily build dendrograms online. With the platform you will create charts from a set of variables, a similarity matrix, and a distance matrix. The utility has two methods (UPGMA and WPGMA) and you add data in CSV or tab-delimited format. Some notable features of the tool are: Generate 100 bootstrap replicates, choose a distance coefficient to compare the variable set, etc. The platform does not have download options; the only thing you can do is take a screenshot of the diagram.
Wessa.net
Wessa.net is an online statistics and forecasting service. The environment includes a hierarchical clustering component that you can use to generate dendrograms. On the website you will find six methods to create the diagrams. When you finish, you save the work to a PostScript (.ps) file or to PNG format with transparency.
Revoledu
We will finish with Revoledu, an online hierarchical clustering calculator. Undoubtedly, the environment is the simplest tool on the list for creating dendrograms. You can copy and paste the data, keep each variable on a separate line, and choose among three methods to create the diagrams (Single-Linkage Clustering, Complete-Linkage Clustering, and Average-Linkage Clustering).
Depending on the type of data and the clustering method you have, you can select any of the four online services to generate dendrograms.
