ANOVA1 Process

To access this process:

See this process in the Command Table.

Process Overview

Carries out one-way analysis of variance on groups of replicate values of a numeric field in a file.

All results are output as an analysis of variance (ANOVA) table. This lists the sources of variation, a column of the corrected sums of squares resulting from the various sources, degrees of freedom associated with each, a column of mean squares which are the sample-based estimates of the variances, and the F-value.

Note: The total keyfield must be no more than 5 words long. Remember that an alphanumeric field should be no more than two words long.

Input Files

Name

Description

I/O Status

Required

Type

IN

Input file, sorted on required keyfields.

Input

Yes

Table

Fields

Name

Description

Source

Required

Type

Default

VALUE

Field for analysis of variance.

IN

Yes

Numeric

Undefined

KEY1

Keyfield 1 for replicate observations.

IN

Yes

Numeric

Undefined

KEY2

Keyfield 2.

IN

No

Numeric

Undefined

KEY3

Keyfield 3.

IN

No

Numeric

Undefined

KEY4

Keyfield 4.

IN

No

Numeric

Undefined

KEY5

Keyfield 5.

IN

No

Numeric

Undefined

KEY6

Keyfield 6.

IN

No

Numeric

Undefined

KEY7

Keyfield 7.

IN

No

Numeric

Undefined

KEY8

Keyfield 8.

IN

No

Numeric

Undefined

KEY9

Keyfield 9.

IN

No

Numeric

Undefined

KEY10

Keyfield 10.

IN

No

Numeric

Undefined

Example

!ANOVA1 &IN(SEDREG),*VALUE(MN),*KEY1(SNUM)

Error and Warning Messages

Message

Description

>>> VALUE FIELD DOES NOT EXIST <<<

The numeric field specified for *VALUE does not exist. Fatal; the process is exited.

>>> ERR 47 <<< ( 0) IN FNDKEY

None of the keys specified were in the file. Fatal; the process is exited.

>>> INPUT FILE NOT SORTED ON KEYFIELD(S) <<<

Fatal; the process is exited.

>>> ERR 121 <<< ( fileno) IN ANOVA1

File read error. Fatal; the process is exited.

>>> MORE THAN 1000 REPLICATES <<<
>>> ONLY THE FIRST 1000 USED <<<

The maximum number of points which may be processed is 1000. All other points are ignored, and processing continues with the first 1000.

 

>>> MORE THAN 250 GROUPS <<<
>>> ONLY THE FIRST 250 USED <<<

The maximum number of groups of points which may be processed is 250. All other groups of points are ignored, and processing continues with the first 250.

 

>>> TOO FEW REPLICATES AND/OR GROUPS <<<
>>> CANNOT CARRY OUT ANALYSIS OF VARIANCE <<<
>>> MINIMUM REQUIREMENT IS FOR 2 REPLICATES <<<
>>> IN EACH OF 2 GROUPS <<<

Insufficient data in input file for analysis of variance. Fatal; the process is exited.