On the Existence and Uniqueness of the Maximum Likelihood Estimators of Normal and Lognormal Population Parameters with Grouped Data

Figure 3

Grouped data: 𝜏₁=0, 𝜏₂=1.5, 𝜏₃=3, 𝜏₄=4.5, 𝜏₅=6. Type I left censored data: 𝜏=0.

(a)

(b)