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Class design
This page is for people who are interested in the internals of how the R-packages in the project on (industrial) DoE in R store the detailed design information. It is currently simpler for me to give an overview over this structure here than in the R documentation. Eventually, a good solution for the R documentation will be found.
The class design is one of the enablers of the project on (industrial) DoE in R. Its basic structure is simple: a class design object is a data frame with the attributes desnum, run.order and design.info.
- desnum is a model matrix (without intercept) for the main effects model based on the experiment,
- run.order is a data frame with the actual and the standard run order and an order relating to repeated measurements etc.
- design.info is a list that provides all the information that could be important for subsequent display, analysis and combination functions.
As the project grows, design.info has substantially diversified, with different types of designs requiring different list elements in design.info. The process has not finalized yet, but it is recognized that it is important to keep the structure within a manageable size.
The PDF file gives an overview over the elements of design.info that are (currently) used for the different existing design types. As the structure has not stabilized in all aspects, some of this may still change, particularly for the combination type designs. Furthermore, there will most likely be a list element that covers the characteristics of quantitative factors or distinguishes between qualitative and quantiative factors (details not known yet).
