Presenting data in tables: Guidelines on using row and column headings
A typical data table in a research paper is a matrix of rows and columns, each of which should have an appropriate heading that gives specific information about the content of the row or the column. This post describes how row and column headings should amplify the table title.
Sometimes, the table title is such that readers know right away what the row- and column-heads will be. For instance, if the table title is "Monthly mean precipitation (mm) in five European cities," it is obvious that names of the cities and the twelve months of the year will make the row- and column-heads.
With some table titles, the heads will not be as obvious but can be guessed: a table titled "Speed (km/h) achieved by sprinters on different surfaces" may not even need row heads if it comprises only two columns, one giving the different surfaces (grass, clay, artificial grass, and so on) and the other giving the average speed attained on each surface.
But it is possible that the data are given for each sprinter, in which case the left-most column will carry the heading "Sprinter" and each row heading will be the name of one sprinter. Incidentally, note that the heading uses the singular form Sprinter because each row refers to one sprinter.
If each row uses a different unit of measurement, the unit is typically given after the description or label and separated from it with a comma. Some publishers enclose the unit in brackets. For example, a table that compares five crops on a number of attributes may have a column for each crop and the following row headings: Area, ha; Productivity, tonnes/ha; Duration, days; and so on or Area (ha), Productivity (tonnes/ha), Duration (days), and so on. With such tables, the heading for the left-most column needs some thought: in the above example, Attribute or Parameter may serve the purpose. It is important to supply such a heading, one that states what is common to all the rows.
Row- or column-heads may include a multiplier to limit the number of digits in each cell: for example, instead of filling the cells with values such as $ 12,000, $ 8,000, and $ 32,000, the heading says "$, in thousands," and the values are given as 12, 8, and 32. Avoid using a string of zeros in such headings; in the above example, do not give the heading as $, in '000.
Because space is often a constraint in row- or column-heads, abbreviations and symbols are freely used in phrasing such heads.
You can learn more about presenting your data effectively in tables in this article: Presenting your tables effectively.
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