parseStats  R Documentation 
The functions unparseStats
and stats2json
serialize the
statistics as a JSON record. The function parseStats
reverses
the process.
parseStats(slist)
unparseStats(slist, flatten=FALSE)
stats2json(slist, flatten=FALSE)
slist 
A list of statistics. For 
flatten 
If true, then vectorvalued statistics (i.e.,

The function unparseStats
massages the list of statistics so it
will be output in clean JSON (in particular, using
unboxer
to make sure scalars appear as scalars
and not vectors). The function stats2json
is just
toJSON(unparseStats(slist)).
If flatten
is true, then vector value statstics will be
flattened. For example, if the statistic “Physics_Margin” has
three values with labels “High”, “Medium”, and
“Low”, then it will be replaced with three statistics with the
names “Physics_Margin.High”, “Physics_Margin.Medium”,
and “Physics_Margin.Low”.
The function parseStatistics
is designed to reverse the
process.
The function unparseStats
returns a list which is ready to be
passed to toJSON
. In particular, scalars are
marked using unboxer
.
The function stats2json
returns a string containing the JSON.
The function parseStats
returns a list of statistics values.
this is suitable for being set to the stats
field of the
StudentRecord
object.
When using flatten=TRUE
, avoid periods, ‘.’, in the
names of statistics, as this marker is used to recreate the nested
structure in parseStats
.
Russell Almond
buildObject
gives general information about how
the parsing/unparsing protocol works.
Statistic
gives a list of available statistics.
StudentRecord
talks about the statitic fields of
the student records.
stats < list(Physics_EAP=0,EnergyTransfer_EAP=.15,
Physics_Margin=c(High=1/3,Medium=1/3,
Low=1/3))
stats2json(stats)
stats1 < parseStats(ununboxer(unparseStats(stats)))
stopifnot(all.equal(stats,stats1,tolerance=.0002))
stats2json(stats,flatten=TRUE)
stats2 < parseStats(ununboxer(unparseStats(stats,flatten=TRUE)))
stopifnot(all.equal(stats,stats2,tolerance=.0002))
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