What is the convention for denoting functions of two variables in statistics?

  • Thread starter Legendre
  • Start date
  • Tags
    Notation
In summary, the notation f(x;a) is commonly used in mathematical statistics to show that a distribution depends on a parameter, while f(x,a) is more commonly used to denote a function of two variables. Both notations are acceptable, but they may have different meanings depending on the context in which they are used.
  • #1
Legendre
62
0

Homework Statement



Quick question...

I have seen both being used : f(x,a) and f(x;a). What is the usual convention? Are both acceptable to denote functions of 2 variables (in this case f is a function of both x and a). Or are there vital differences between the two that I don't know about?

Thanks! :)

Homework Equations



N.A.

The Attempt at a Solution



N.A.
 
Physics news on Phys.org
  • #2
I don't recall ever seeing this notation -- f(x; a) -- being used.
 
  • #3
notation like [tex] f(x;a) [/tex] is used in mathematical statistics when you want to show that a distribution depends on a parameter (real or vector-valued). for example, if you are talking about a normal distribution with some mean and standard deviation, writing
[tex] \theta = (\mu, \sigma)[/tex] the density would be indicated [tex] f(x;\theta)[/tex]

it indicates that the function depends on [tex] x [/tex] and involves a parameter [tex] \theta [/tex] (so, as we say in statistics, by varying [tex] \theta [/tex] we obtain not one but a family of normal distributions.
 

Related to What is the convention for denoting functions of two variables in statistics?

1. What is the difference between f(x,a) and f(x;a) notation?

The main difference between these two notations is the presence of a comma or a semicolon between the variables x and a. In f(x,a) notation, the comma indicates that a is a fixed parameter, while in f(x;a) notation, the semicolon indicates that a is a variable parameter.

2. How do you interpret f(x,a) and f(x;a) notation in mathematical expressions?

f(x,a) notation is read as "f of x, with a held constant" while f(x;a) notation is read as "f of x, with a as a variable". This means that in f(x,a) notation, a is treated as a constant value, while in f(x;a) notation, a can take on different values.

3. When should I use f(x,a) notation and when should I use f(x;a) notation?

f(x,a) notation is typically used when a function has more than one variable and it is necessary to specify which variable is being held constant. f(x;a) notation is used when a function has a variable parameter and it is important to show that a is a variable. Both notations can be used interchangeably, but it is important to be consistent within a given context.

4. Are there any other notations that are similar to f(x,a) and f(x;a)?

Yes, there are other notations that are similar to f(x,a) and f(x;a) such as f(x|a) and f(x:a). These notations are used to represent the same concept of a fixed and variable parameter in a function. However, the use of commas and semicolons is more common and widely accepted in mathematical expressions.

5. Can f(x,a) and f(x;a) notation be used in other fields besides mathematics?

Yes, f(x,a) and f(x;a) notation can also be used in other fields such as physics, engineering, and computer science to represent functions with multiple variables and parameters. It is a versatile notation that can be applied in various disciplines to convey the same meaning of a fixed and variable parameter in a function.

Similar threads

  • Calculus and Beyond Homework Help
Replies
1
Views
339
  • Calculus and Beyond Homework Help
Replies
24
Views
3K
Replies
2
Views
769
  • Calculus and Beyond Homework Help
2
Replies
36
Views
3K
  • Calculus and Beyond Homework Help
Replies
21
Views
2K
Replies
36
Views
4K
  • Calculus and Beyond Homework Help
Replies
2
Views
1K
  • Calculus and Beyond Homework Help
Replies
5
Views
1K
  • Calculus and Beyond Homework Help
Replies
11
Views
2K
  • Calculus and Beyond Homework Help
Replies
14
Views
2K
Back
Top