Translations:Expression Manager - presentation/55/en

1. Expression: Anything surrounded by curly braces:
   • As long as there is no white space immediately after the opening brace or before the closing curly brace.
   • The expression content is evaluated by EM, so it can contain mathematical formulas, functions, and complex string and date processing.
2. Tailoring: Sometimes called "piping". It is the process of conditionally modifying text:
   • You have access to all 'replacement fields', participant data, and response data.
   • You also have easier access to questions, answers, and their properties.
3. Relevance Equation: A new question attribute controlling question visibility:
   • If there is a relevance equation, then the question is only shown if the relevance evaluates to true.
   • Internally, all array_filter and array_filter_exclude commands become subquestion-level relevance.
4. SGQA (how variables were named in the past):
   • Stands for Survey-Group-Question-Answer
   • SGQA variable names look like 123X5X382X971, and may have subquestion suffixes.
   • These variable names are specific to the underlying S/Q/G/A database codes, so they often need to be changed
5. Equation Question Type: A new question type that saves calculations or reports to the database:
   • It is like a Boilerplate question, but its contents are saved to the database even if you set "Always Hide this Question".
6. Question Code: This is the preferred variable name for EM:
   • This can be a descriptive name indicating the purpose of the question, making it easier to read complex logic.
   • Valid question codes should NOT start with a number, so when using the question code to number your questions, simply use "q1", or "q1a" or "g1q2".
   • This is what becomes the variable name if you export data to SPSS or R. So, if you do statistical analysis, you need to create only unique question codes.