Internal and External Validity

Internal validity of results represents the level of confidence in the causality in a relationship between parameters. While external validity is an expression for the extent at which the results can be implemented and extended in other situations.  

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Resource: Internal vs External Validity 

Type: Article 
Who it’s for: Learners with previous experience in Data analysis and manipulation. 
Why we love it: Detailed resource with sufficient information to get hands on experience 

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Resource: Internal and external validity: can you apply research study results to your patients? 

Type: Case study 
Who it’s for: Learners who are interested in getting deeper in understanding the know how 
Why we love it: A case study with information on the usability of data