Computes jackknife variance
jackknifeVariance(j, kernMatrix, delta, y)integer index for deleted observation in the jackknife procedure.
(n-1) by m matrix of kernel values centered at missing
observation j where n is the total number of observations and m is the
number of candidate bandwidths.
Binary vector of length n indicating missingness.
1 where y is observed and 0 where y is missing.
numeric vector of length n of observed values and imputed values.
returns a single numeric value for the estimate of the jackknife variance.