spdesign v0.0.4
- Added function level_balance() that produces a list of level
occurrences in the design to inspect level balance
- Updates to documentation, examples, and syntax description
- Minor bug fixes
spdesign v0.0.3
- Fixed a bug related to optimizing for c-efficiency where it would
sometimes fail to correctly identify the denominator.
- Fixed several bugs related to using a supplied candidate set with
alternative specific constants and attributes. Checks have been updated.
The code will now also add zero-columns for alternative specific
constants and attributes in the utility functions where they are not
present. This ensures that all matrices used when calculating the first-
and second-order derivatives of the utility functions are square.
- Fixed an issue where it failed to catch a mismatch in naming between
the supplied candidate set and the utilty functions which caused hard to
debug situations. Error messages should now catch this and provide
additional information to help find the cause. Syntax is updated to
reflect this as well.
- Fixed an issue where the full factorial would be generated even when
the “rsc” algorithm was used, which caused memory issues for large
designs. It is now only generated for the “random” and “federov”
algorithms. A small section is added to the syntax vignette to clarify
this.
- Minor bug fixes
spdesign v0.0.2
- New function ´probabilities()´ will now return the choice
probabilities by choice task.
- Suppress warnings when calculating the correlation between the
blocking column and the attributes to avoid warning when calculating
correlation with respect to a constant.
- After a number of candidates without improvement try a new design
candidate when using the RSC algorithm
- Updated package load message
- Fixed roxygen @docType issue
spdesign v0.0.1
- This is the first working version of the
spdesign
package that is able to create simple efficient designs for the MNL
model.