Data Map

A data map is a template designed by DIME for organizing the 3 main aspects of data work: data analysis, data cleaning, and data management. The data map template consists of three components: a data linkage table, a master dataset, and data flow charts. DIME Analytics recommends using data maps to organize the various components of your data work in order to increase the quality of data, as well as of research.

Read First

• The best time to start creating a data map is before starting with data collection.
• A data map template has three components: a data linkage table, a master dataset, and data flow charts.
• The research team should keep updating the data map as the project moves forward.
• The data map template is meant to act as a starting point for data management within a research team.
• It is important to understand the underlying best practices for each component of a data map before discussing which components do not apply in a given situation.

Overview

Most of the details required for preparing a data map are not complex. For example, it is easy for the field coordinator (FC) to remember what the respondent ID is when data collection is still ongoing. However, it is harder to ensure that everyone in the research team has the same level of understanding. Further, as time passes, the field coordinator (FC) themselves can forget what exactly a particular variable measures, or why it was included in the dataset. Research teams often do not spend enough time planning and organizing data work because small details like the purpose of a variable might seem obvious. However, this tendency is exactly what makes lack of, or inadequate planning a common source of error. Fortunately, the solution - a data map - is quick and easy to implement.

Data Map Template

The DIME Analytics data map template has three components: a Data Linkage Table, one or several Master Datasets and one or several Data Flow Charts. The data linkage table lists all the datasets in your project and how they link to each other. For example, it would describe how a student dataset can be merged to a school dataset, and which ID variable can be used to do so. The data linkage table also includes meta-information, such as where the original version of these data sets are backed-up, etc. There should only be one data linkage table per project. See below for templates, examples, best practices and other details.

The master dataset(s) are how you keep track of units for each level of observation. For example, keeping track of each household if your unit of observation is households, each company if your unit of observation is companies, etc. Most importantly, the master dataset specifies the uniquely and fully identifying ID variable for each unit. The master dataset should also include variables related to the research design, such as sample and treatment assignment variables. The master dataset should be the authoritative source of all information included. Many projects have multiple units of observation, requiring one master data set for each unit of observation that is central to the research. See below for details on what units are central and other details and best practices for master datasets.

The final component in the DIME Analytics data plan template is the data flow charts. There should be one flow chart per analysis data set in the project. Each data flow chart shows what datasets are needed to create the analysis dataset and how they may be combined by appending or merging them. All original datasets in a data flow chart should be listed in the data linkage table; the information in the data flow chart, for example, which variables to merge datasets on, should correspond to the information in the data linkage table. See below for more examples, best practices and other details related to data flow chart.

- If you are in the middle or towards the end of your project and you spend more time linking your datasets than doing other data work, you should step back and create a data plan.

- As with all templates, you might need to add items to our Data Plan Template or you may find that some items do not apply.