This research investigates the efficiency of the 17 PoS system types in the twonumber
classification. The main focus of the research is twofold. Initially, the research
aims to determine whether the efficiency formula created for this PoS system
classification is reasonable. This is done by evaluating the efficiency of each PoS system
type, including subtypes, using the efficiency formula. The formula is valid if each PoS
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system (sub)type has a unique interval of efficiency values except (sub)types which are
maximally efficient or have equivalent structures.
If the efficiency formula is found to be valid, then the PoS system classification
can be analyzed. The aim is to determine whether there is a correlation between the PoS
system type label and the efficiency calculated by the efficiency formula. An efficiency
interval will be determined for each PoS system type using the efficiency formula. The
efficiency of the PoS system (sub)type is determined with consideration to different word
order rules since the efficiency value depends on how free the word order is. The
variation of word order rules results in the interval of efficiency values. The interval will
include the minimum efficiency and maximum efficiency. The midpoint of the interval
will also be considered. Linear and non-linear regression will be used to fit a 3D surface
to the data. If the adjusted coefficient of multiple determination value is .70 or higher,
then a correlation exists.