Hello,

I am working on a study which is about airlines' efficiency by using "Teradial" STATA ado file.

I had a problem with the analyze.
Even though I have installed the ado file, the STATA gives the following error:

Radial (Debreu-Farrell) output-based measures of technical efficiency under assumption of CRS
technology are computed for the following data:

Number of data points (K) = 69
Number of outputs (M) = 1
Number of inputs (N) = 4

Data for reference set are not provided. Reference set is formed by 69 data points, for which
measures of technical efficiency are computed
unrecognized command
r(199);


Could you help me with this error?

Thanks in advance.