I have a client who wants to be able to base their dummy coded estimates (represented as WTP/WTA which I know is a contentious issues) off different levels than the standard sawtooth output which is to set the last level of an attribute as the reference level. I'm perfectly happy to do this by simply subtracting/or adding (depending on the sign) the desired estimate value from all the other estimates so that the reference level becomes zero wherever it is located in the level order - they wish to do this to match up with a contingent valuation question they have also posed in the survey. However, if I am using simple aggregate logit estimation how do I establish the t-ratio for the level that was arbitrarily set to zero by the software? and how do the other t-ratios change as the estimates change in value. This is more a reporting issue than anything else but I believe it's important to be able to show if the level(s) are or remain significant (which I would expect them to) but also that the arbitrary zero level is also significant. Is there a way to achieve this?
Thanks in advance