====== Cross sectional studies  ======
{{vimeo>136584706?large|Cross sectional studies}}

==== PowerPoint ====
  * {{:research_methods: Microlecture 4 5 Cross sectional studies 20150812.pptx| Cross sectional studies}}

{{tag>unit_of_analysis variable_attribute variable_value causality spurious_relationship time_order reverse_causation dependent_variable endogenous_concept independent_variable exogenous_concept cross-sectional_research external_invalidity internal_invalidity reverse_causation}}
{{tag>research_methods:ut research_methods:video}}
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