STUDENTS_T Function

Returns the Student's t distribution of the values in an expression.

Categories: Aggregate
Descriptive Statistics
Alias: T
Returned data type: DOUBLE
Syntax
Arguments
Details
Comparisons
Example
See Also

Syntax

STUDENTS_T(expression)

Arguments

expression

specifies any valid SQL expression.

Data type DOUBLE
See <sql-expression>
FedSQL Expressions

Details

The STUDENTS_T function returns the probability for the Student's t distribution with n-1 degrees of freedom and a central distribution (nc=0).
You can use an aggregate function to produce a statistical summary of data in the entire table that is listed in the FROM clause or for each group that is specified in a GROUP BY clause. The GROUP BY clause groups data by a specified column or columns. When you use a GROUP BY clause, the aggregate function in the SELECT clause or in a HAVING clause instructs FedSQL in how to summarize the data for each group. FedSQL calculates the aggregate function separately for each group. If GROUP BY is omitted, then all the rows in the table or view are considered to be a single group.

Comparisons

The STUDENTS_T function returns the Student's t distribution. The PROBT function returns the probability that the Student's t distribution is less than or equal to a given value.

Example

Table: DENSITIES
The following statements illustrate the STUDENTS_T function:
Statements
Results
 
select students_t(density) from densities;
 
3.565402
 
select students_t(population) from densities;
 
3.267438

See Also

Functions:
PROBT Function
SELECT Statement Clauses:
SELECT Clause
GROUP BY Clause
HAVING Clause
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Last updated: February 23, 2017