Uniform Distribution: What If b-a < 1?

Click For Summary
SUMMARY

The discussion centers on the uniform distribution, specifically the case when the interval width (b-a) is less than 1. When X follows a uniform distribution U(a, b), the probability density function is defined as f(x) = 1/(b-a). In scenarios where b-a < 1, such as X ~ (0.5, 1), the density function can yield values greater than one, exemplified by f(x) = 2. However, this does not imply that the probability exceeds one; rather, the actual probability remains valid as long as the integral of the density function over any range does not exceed one, ensuring normalization and non-negativity.

PREREQUISITES
  • Understanding of uniform distribution and its properties
  • Familiarity with probability density functions
  • Knowledge of normalization in probability theory
  • Basic calculus for integrating functions
NEXT STEPS
  • Study the implications of probability density functions exceeding one
  • Learn about normalization techniques in probability distributions
  • Explore the concept of cumulative distribution functions (CDF)
  • Investigate other types of distributions and their properties
USEFUL FOR

Students of statistics, data scientists, and anyone interested in understanding the nuances of probability distributions and their applications in real-world scenarios.

circa415
Messages
20
Reaction score
0
If X ~ U(a, b) then f(x) = 1/(b-a)

but what if b-a is less than 1

for instance if X ~ (.5,1) then f(x) = 2?

I'm a bit confused. Any help would be appreciated.
 
Physics news on Phys.org
A probability distribution p(x) may take on values greater than one. It doesn't mean something has a probability of more than one of happening because, remember, p(x) isn't itself a probability. The probability that X lies in the range x->x+dx is given by p(x)dx, and as long as the integral of this over any range is not greater than one, which is assured by normalization and the fact that p(x) must be non-negative, the actual probability will never be greater than one.
 
Last edited:

Similar threads

  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K