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

Figure 5

Grouped data: 𝜏₁=−2, 𝜏₂=0, 𝜏₃=2, 𝜏₄=4, 𝜏₅=6. Type I left censored data: 𝜏=−2.

(a)

(b)