.CHS File Format
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The .CHS file format is very similar to the .CHO file format, and is used for constant sum (allocation) style CBC studies. The .CHS format files are used in Sawtooth Software's CBC/HB program. Some power-users modify the .CHS file (usually with an automated script outside of SSI Web) for certain advanced applications. The format is as follows:

8960  2  6  12  0
6  1
3
2  1  2  3  2  3    7
3  3  3  1  3  1    3
4  2  1  2  1  2    0
.
.
.
(lines 3-6 repeated, for 11 more tasks for this respondent)

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


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


Lines 3-6 are repeated for each choice task

Line 3: Task 1 format
3
Number of concepts in first task


Line 4: First concept information
2
1
2
3
2
3
7
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
Point allocation


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

Line 5: Second concept information
3
3
3
1
3
1
3
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
Point allocation


Line 6: Third concept information
4
2
1
2
1
2
0
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
Point allocation


Note: if a "None" concept is present, it is included as the last alternative in the task, with all attribute level codes as "0."