stochTable: Create a look-up table for stochastic curtailment

In marjoleinF/curtail: A package for test curtailment

Description

Creates a look-up table for early stopping of item administration, for stochastic curtailment.

Usage

  stochTable(dataset.train, Xstar, gamma0 = 0.95, gamma1 = 0.95)

Arguments

dataset.train	Dataframe, containing item scores only
Xstar	cut-off value for the final test score to be used
gamma0	The threshold for the probability, calculated using the 'not-at-risk' training observations, that the classification decision based on the stochastically curtailed version will match that of the full-length instrument.
gamma1	The threshold for the probability, calculated using the 'at-risk' training observations, that the classification decision based on the stochastically curtailed version will match that of the full-length instrument.

Details

The code is still under development and might change in future versions.

Value

Returns a look-up table with cut-off values for every item, to be used for early stopping of item administration.

References

Fokkema, M., Smits, N., Finkelman, M. D., Kelderman, H., & Cuijpers, P. (2014). Curtailment: A method to reduce the length of self-report questionnaires while maintaining diagnostic accuracy. Psychiatry Research 215, 477-482.

Fokkema, M., Smits, N., Kelderman, H., Carlier, I.V. & Van Hemert, A.M. (2014). Combining decision trees and stochastic curtailment for assessment length reduction of test batteries used for classification. Applied Psychological Measurement, 38(1), 3-17.

Finkelman, M.D., Smits, N., Kim, W. & Riley, B. (2012). Curtailment and stochastic curtailment to shorten the CES-D. Applied Psychological Measurement, 36(8), 632-658.

Examples

  stochTable(itemscores, 19)
  # try lower gamma values for earlier stopping:
  stochTable(itemscores, 19, gamma0 = .75, gamma1 = .75)

marjoleinF/curtail documentation built on May 21, 2019, 11:47 a.m.