questionMarks {compare} | R Documentation |
These functions are used to specify how the result of a comparison between two objects should be converted to a numeric mark.
questionMarks(answerNames, maxMark, ...) rule(answerName, falseMark, ...) transformRule(pattern, mark)
answerNames |
The names of objects that have been compared. |
maxMark |
The maximum mark for the question. |
answerName |
The name of one object that has been compared. |
falseMark |
How many marks to deduct if the comparison result
was |
pattern |
A regular expression to search for within the comparison transformations. |
mark |
How many marks to deduct if the regular expression is matched. |
... |
For |
These functions are used to define a marking scheme. The
function markQuestions()
can then be used to apply
the results to a set of comparisons, as generated by
compareFiles()
.
An object of class "questionMarks"
.
Paul Murrell
markQuestions
and
compareFiles
# Check a comparison involving an object called 'IndianMothers' # Start with a mark of 1 and deduct 1 if the comparison failed questionMarks("IndianMothers", maxMark=1, rule("IndianMothers", 1)) # Check comparisons involving several objects # Start with a mark of 2, for each unsuccessful comparison # deduct 1 mark, and if a comparison involving the object # 'class' includes a coercion transformation, deduct 1 mark. questionMarks(c("id", "age", "edu", "class"), maxMark=2, rule("id", 1), rule("age", 1), rule("edu", 1), rule("class", 1, transformRule("coerced", 1)))