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2006-05-17

Hi I have been reading up on conjoint analysis and I want to know if I have a questionnaire that assesses the preference of customers for lets say price (low and high) and area (dirty and clean) and on some other combination like nutritional value of meal (high and low) and staff (courteous and discourteous). So a question may be structured such that a customer is given the option to rate his/her preference between a combination of low price dirty area (lowest score) and on the other end of the continuum high price and clean area (highest score).

How do I use coSPSS conjoint mmand to analyse this or am I missing something and should be looking at some other way to do this?

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2006-5-17 00:21:00

First, you must create a design. In your example, you listed 4 binary attributes. That means that there are 16 possible combinations. Your design could be a full factorial design with all 16 possible combinations. Take a look at the ORTHOPLAN documentation.

Next, you must collect data from multiple respondents. You could create
"cards" showing each possible product and ask the respondent to rank or rate the cards. More researchers use ratings than use ranks. Take a look at PLANCARDS.

Once you have the data, you analyze them using the CONJOINT procedure.
CONJOINT essentially does a within-persons OLS regression. What you can
learn from the CONJOINT procedure are attribute importances and the relative preferences for the levels of the attributes.

Lastly, you can use CONJOINT to do so-called simulation. This is where you
can model share of preference for possible products with combinations of
attribute levels.

There are many issues in the use of conjoint analysis. As the number of
attributes and levels goes up, it becomes unreasonable to use a full profile design, for the resulting rank or rating task would prove tiring for the respondent and most likely produce data with serious validity and reliability problems. Therefore, researchers turn to fractional factorials and other designs. Do you expect interactions between attributes, or will a main effects design suffice? Also, you want to create a data elicitation method that simulates the real decision process, meaning you might use physical props or multimedia. Regarding traditional conjoint analysis as a method,
some researchers object to the method itself for the reason that eliciting
preferences does not tell much about what respondents would actually choose in a buying situation. For this reason, some researchers prefer choice analysis to traditional conjoint analysis.

Anthony Babinec

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2006-5-17 00:23:00

My question is this in the orthoplan given that in my main file I have rated the preferences of customers based on a comparison of what firm A offers and what firm B offers which is based on some combinations of the factors (this is for each question). How can I design an orthoplan when it is not a full model? I dont know if I am clear on this since I am green in this area.

Thanks

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2006-5-17 00:24:00

Your question is not very clear so it is difficult to come up with an
answer. Nonetheless, if I understand correctly, you want to come up with a
design that is not full factorial, yet at the same time is balanced over
your features and levels. I am not sure orthoplan offers such capability, as
I am not using it, but you should consult some literature in the area of
"efficient designs", specifically papers written by Warren Kuhfeld from the
SAS Institute. I know they have macros in SAS that can generate such designs for you, starting from a full factorial design.

I don't know if I am answering your question though.

Dan

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2006-5-17 00:26:00

It sounds like you don't need Orthoplan. You already used a plan and collected rating data. It also sounds like the plan was not fractional factorial, so that the Conjoint procedure would not be the one to use.

The data structure and the response type(ratings?) should be considered when coming up with an analytical approach.

Anthony Babinec

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2006-5-17 00:26:00
Hello

Probably you only need to make a linear regression. (if i did understand
your question).

João Duarte
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