.CHO File Format
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You can export CBC data (discrete choice) from SSI Web to a .CHO format. The .CHO format files are used in many other Sawtooth Software programs for analyzing CBC data, including Latent Class, and Hierarchical Bayes (HB) applications. Some power-users modify the .CHO file (usually with an automated script outside of SSI Web) for certain advanced applications. The format is as follows:

8960  2  6  12  1
6  1
3  1
2  1  2  3  2  3
3  3  3  1  3  1
4  2  1  2  1  2
2  32
.
.
.
(lines 3-7 repeated, for 11 more tasks for this respondent)

Line 1:    Respondent record information
8960
2
6
12
1
Respondent
Number
"Extra"
Variables
Number of
Attributes
Number of
Choice Tasks
None option
0=N, 1=Y,
2=Dual Response None


Line 2: "Extra" Variables (may include as many numbers as specified on Line 1)
6
1
Interview
Duration
Segmentation
Variable


Lines 3-7 are repeated for each choice task

Line 3: Task 1 format
3
1
Number of concepts in first task
Depth of preference in first task (always 1)


Line 4: Levels displayed in first concept
2
1
2
3
2
3
Level 2 of
Attribute 1
Level 1 of
Attribute 2
Level 2 of
Attribute 3
Level 3 of
Attribute 4
Level 2 of
Attribute 5
Level 3 of
Attribute 6


Note: Missing levels (partial profile and alternative specific designs) are indicated with "0"'s.

Line 5: Levels displayed in second concept
3
3
3
1
3
1
Level 3 of
Attribute 1
Level 3 of
Attribute 2
Level 3 of
Attribute 3
Level 1 of
Attribute 4
Level 3 of
Attribute 5
Level 1 of
Attribute 6


Line 6: Levels displayed in third concept
4
2
1
2
1
2
Level 4 of
Attribute 1
Level 2 of
Attribute 2
Level 1 of
Attribute 3
Level 2 of
Attribute 4
Level 1 of
Attribute 5
Level 2 of
Attribute 6


Line 7: Choice information
2
32
Concept
Chosen
Task duration


* In this example, the none option, if chosen, would be represented as concept 4.
** Missing answers are indicated by Concept Chosen set to "0."

Coding Dual Response None Answers

In the standard .CHO layout, the coding of each task is completed by a line with two values:
"Choice" and "Task Duration." With the "Dual-Response None" format, each choice task is completed
by a line with four values, such as:

Line 7: Dual-Response None Choice information
3
27
1
4
1st stage
choice
Task duration
Buy=1
No Buy=2
Task duration