RcmdrPlugin.temis (version 0.6.1)

varTimeSeriesDlg: Corpus Temporal Evolution

Description

Variation of the number of documents in the corpus over time, possibly grouped by variable.

Details

This dialog allows computing and plotting the number of documents over a time variable. The format used by the chosen time variable has to be specified so that it is handled correctly. The format codes allowed are those recognized by strptime (see ?strptime), in particular:

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Time units are chosen automatically according to the values of the time variable: it is set to the smallest unit in which all time values can be uniquely expressed. For example, if free dates are entered, the unit will be days; if times are entered but minutes are always 0, hours will be used; finally, if times are fully specified, seconds will be used as the time unit. The chosen unit appears in the vertical axis label of the plot.

The rolling mean is left-aligned, meaning that the number of documents reported for a point reflects the average of the values of the points occurring after it. When percents of documents are plotted, time units with no document in the corpus are not plotted, since they have no defined value (0/0, reported as NaN); when a rolling mean is applied, the values are simply ignored, i.e. the mean is computed over the chosen window without the missing points.

See Also

setCorpusVariables, meta, zoo, xyplot, varTimeSeriesDlg, recodeTimeVarDlg