I' m looking for estimation of WTA instead of WTP, that frequently used in studies. In fact I want to estimate the minimum compensation payment that local people are willing to accept for lose their access to mangrove forest due to protection scenarios.
I' m trying to analyze a dataset with one starting value as part of the CVM study. I have used the double bounded dichotomous method and have succefully installed the doubleb command. In order to estimate WTA, the bid2 (t2) is lower bid when answer1 (answer to initial bid) is equal to 1( i. e. local people have positive response to initial bid for accept as compensation) , and vice versa (conversely in WTP estimation).
However, when I attempt to use the program with my dataset, Stata returns the following error:
doubleb bid1 bid2 answer1 answer2
There is an inconsistency in at least one of your observations.
Check for situations where the response to the first question is yes but the second bid is lower t
> han the first
or for situations where the response to the first question is no but the second bid is higher than
> the first.
After solving this issue try the command again.
r(498);
My dataset contains no missing values. There are one bid1 values and 2 different bid2 values . answer1 and answer2 are just
dummy variables.
Hi Zahra,
I am guessing that the error has to do with how the dummy variables are coded for "answer1" and "answer2" for some of your observations. As the error message says there is an inconsistency between how the response was coded on the first bid vs the second bid.
You may have to go through these values one at a time to see if there are any coding errors.
After that, if you have not found the problem, I suggest contacting the author of the program.
I hope this helps
Ariel
Hi Ariel,
Thanks for your kind attention
I discussed my problem with the author of program. He answered "the command is programmed in such a way that the likelihood function makes sense only when you estimate WTP" .
So I think that I can not use this command now.
Do you know an alternative command for estimating double bounded dichotomous choice models in Stata?
Take a look at clogit, asclogit, or asroprobit.. You may be able to manipulate these models to work for your data. Here is an example (see the link)
Good luck!
Ariel
http://www.ats.ucla.edu/stat/stata/seminars/stata10/choice_models.htm
You should enter your data using Excel and after that you choose to use any econometric package to estimate your model.
How can I estimate WTP for double-bounded question by SPSS.
I am studying WTP for wastewater service based on Double-bounded dichotomous choice. Can I use SPSS to analyse WTP and which command for estimating double-bounded dichotomous choice models in SPSS.
Thank you so much.
probably you have entered wrong value to either of the bid. check your data one by one to check if it contain correct values. doubleb is very senstive and cant run if u mistake one value
. doubleb
command doubleb is unrecognised
r(199);
The above message was shown in my screen when i tried to run this programme in stata.
could anyone help me to solve this problem.....
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