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A network diagram is made up of a set of nodes and lines that connect those nodes. Usually a product of social network analysis, a network diagram is the visual display of how people (or other elements) in a network are connected.
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Inferential statistics suggest statements or make predictions about a population based on a sample from that population. Non-parametric tests relate to data that are flexible and do not follow a normal distribution. 
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Inferential statistics suggest statements about a population based on a sample from that population. Parametric inferential tests are carried out on data that follow certain parameters: the data will be normal (i.e. the distribution parallels the bell curve); numbers can be added, subtracted, multiplied and divided; variances are equal when comparing two or more groups; and the sample should be large and randomly selected. 
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Descriptive statistics provide simple summaries of (large amounts of) information (or data). These summaries are quantitative (e.g. means, correlations) or displayed visually (in graphs, scatterplots, etc.).
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Crosstabulation (or crosstab) is a basic part of survey research in which researchers can get an indication of the frequency of two variables (e.g. gender or income, and frequency of school attendance) occurring at the same time. 
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Summary statistics provide a quick summary of data and are particularly useful for comparing one project to another, or before and after.

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