rhat_ptb: Semi-supervised correlation estimation

In stepcie/sslcov: Semi-Supervised Estimation Of Covariance

Description

This function estimates the correlation between an outcome available only for a small subset of the data and a covariate. The outcome is imputed to all the data using a smoothed predictor learned thanks to a set of surrogate variables, available for all the data.

Usage

rhat_ptb(data, nn, outcome_name = NULL, covariate_name = NULL,
  surrogate_name = NULL, bw, cdf_trans = TRUE, weights = NULL,
  ptb_beta = TRUE, adjust_covariates_name = NULL, do_interact = TRUE,
  X = NULL)

Arguments

data	the data. The first nn rows should be the labeled data, the remaining rows should be the unlabeled data.
nn	the number of labeled data
outcome_name	a character string containing the name of the column from data containing the partly missing outcome of interest
covariate_name	a character string containing the name of the column from data containing the covariate to be related to the outcome of interest
surrogate_name	a character string vector containing the name of the column(s) from data containing the surrogate variable(s)
bw	the bandwidth to use
cdf_trans	a logical flag indicating wether the smoothing should be performed on the data transformed with their cdf. Default is TRUE. See Details.
weights	a vector of weights in case a weighted version of the correlation has to be computed. Default is NULL, in which case, no additional weighting is done and regular perturbation is performed.
ptb_beta	logical flag indicating whether beta coefficient should be perturbed. Dafault is TRUE.
adjust_covariates_name	optional vector of names of the covariates to adjust on during imputation and smoothing. Default is NULL.
do_interact	logical flag indicating whether interactins between x and covariates should be taken into account when imputing y. Default is FALSE.
X	perturbation index needed for sapply call. This is a purely artificial argument and is never used in the functions (only needed for sapply to work). Default is NULL.

Details

Smoothing over the CDF transformed data prevents some tail estimation issues when the new data are subsequently large.

Value

a list with the following elements:

• rhat

• bw the bandwith used

• data_sup

• W_unlabel

See Also

smooth_ssl rhat

stepcie/sslcov documentation built on May 30, 2019, 2:39 p.m.