Module ecld 

Symmetric lambda (exponential power / generalized normal) emission density.

ldhmm uses ecld.pdf via gnorm::dgnorm with beta = 2/λ. At λ=1 this is Gaussian.

Source: references/ldhmm/ssrn-2979516.pdf §2; ldhmm ecld.* functions.

Functions

ecld_cdf

CDF of the symmetric lambda distribution (ldhmm ecld.cdf / gnorm).

ecld_log_pdf

ecld_pdf

PDF of the symmetric lambda distribution (ecld / generalized normal).

ecld_variance

Emission variance of the symmetric lambda distribution: σ² Γ(3/β) / Γ(1/β), β=2/λ.

natural_to_work

work_to_natural

Natural-parameter style mapping helpers (ldhmm n2w / w2n stability).