est_se: Estimate the standard error
In csetraynor/condma:

Extract relevant features from a glmnet cox fit object.

1	est_se(n, level = 0.95, ul, ll, diff, p = NA)

`n`	number of patients
`level`	It's the level of the ci which is used for finding the quantile function from a t-distribution with df degrees of freedom. Default is CI 95 to perc .975 (Others ci may be used). The quantile will be differently obtained if p_value is provided.
`ul`	upper limit of confidence interval
`ll`	lower limit of confidence interval
`diff`	The difference
`p`	It is assumed that p is equal to the upper bound, difference is required.