You must have come across charts that are overloaded and you find them a pain to read. Yes these are charts that look quite pretty initially but they are read and interpreted, they become unbearable.
A spreadsheet is a sheet consisting of rows and columns which intersect with each other to form cell. Data are entered in each cell for calculation, storage or manipulation. Excel is collection of electronic spreadsheets
There are a lot of resources available for modeling on internet, available from books to tutorial to boot-camp trainings; this one focuses more on the concept of modeling rather then discussing details of any particular field.
When we are developing a model or trying to test some formula, we need data and when we don’t have one, we have to create it to suit our needs. This is frequently called dummy data.
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