Statalisters,
Does anyone have Stata code for equivalence testing? I may have a need to
do some analyses using these concepts but have discovered that the publicly
available Stata code, -equim- and -equip- (sg21, STB-17 & STB-24), has
problems.
When I inquired about the problems I found, the author of the code stated
that "all the equivalence test programs have a problem when the observed
difference is less than delta" and that "...when using the equim versions,
the lower tail of the t CI is wrong." He goes on to say that "I have no
interest in these programs and will not be updating then under any
conditions that I can now foresee." He also states that "If someone else
wanted to modify these programs, they have my full backing (but probably
should not expect any help from me in doing so)."
I am aware of two (non-Stata) packages that perform these analyses,
EquivTest ($675) and ZumaStat ($79), but have no experience with either
package. Has anyone tried either of these and would you be willing to
provide comments about your experience?
Any other leads would also be appreciated.
Tom Steichen
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