Skip to content
START WITH A QUESTION

What would you like to understand?

Find an answer. See the moment it becomes clear. Follow the idea further.

← Concept directory

Answers for “在保持固定的变量方面,概率和似然有什么区别?”

3 keyword matches

Understanding your question. You can explore the search results below now.

Meet the concept

↗

Probability fixes the parameter and varies the data, resulting in a normalized distribution where the probabilities sum to 1. Likelihood fixes the data and varies the parameter, resulting in a non-normalized curve whose integral does not equal 1.

Conditions: Both views are based on the same conditional expression P(x∣θ)P(x \mid \theta).; Probability view: parameter is fixed, data varies.; Likelihood view: data is fixed, parameter varies.

Meet the concept

↗

The likelihood function is L(p)=(107)⋅p7⋅(1−p)3L(p) = \binom{10}{7} \cdot p^7 \cdot (1-p)^3. It represents the probability of observing 7 heads and 3 tails as a function of the unknown parameter pp, the probability of heads.

Conditions: The number of tosses n=10n=10.; The observed number of heads k=7k=7.; pp is the probability of heads on a single toss.

Understand why

↗

The probability distribution sums to 1 because it accounts for all possible data outcomes under a fixed model, satisfying the axioms of probability. The likelihood curve does not integrate to 1 because it measures relative support for different parameter values given fixed data, and is not constrained to be a probability distribution over the parameter space.

Conditions: Probability view: parameter fixed, data varies over the entire sample space.; Likelihood view: data fixed, parameter varies over its domain.