What Does the Prime Symbol Mean in Statistical Moments?

[freedominator]

sometimes in statistics there is a prime ( ' ) after the variable for moment ( u sub r ) what does that mean?

 

[Simon Bridge]

Please provide an example.
The prime notation is used to differentiate the variable name while keeping a general meaning ... so t and t' are both "time" but may be for different objects or have different uses as in a place-holder variable.

 

[Stephen Tashi]

As Simon says. ( I had to day that!)
In particular, the prime notation is often used to distinguish a "moment about the origin" from a "moment about the mean" of a distribution as in https://en.wikipedia.org/wiki/Central_moment

 

[freedominator]

tyvm

 

[blue_raver22]

The prime symbol (') after the variable for moment (u sub r) indicates that the moment being referred to is a derivative of a higher order. In other words, it is a higher degree of the original moment. This is commonly used in statistics to represent a specific moment in a distribution, such as the second moment (u sub 2) or the third moment (u sub 3). The prime symbol is often used in mathematical notation to denote differentiation, so in this case, it is used to indicate a higher order moment.