Using two inputs and one output variable in measuring Malmquist Productivity Index

[Dadang Ramdhan]

Hi

I am trying to calculate malmquist productivity index with two inputs (I_cp I_rs) and one output (O_tgs), but when I typed malmq I_cp I_rs=O_tgs, ort(I) period(year) the stata mentions that the syntax is invalid.

Does anyone knows why it happens?

regards

[Serena Chang]

Hi,

Write "malmq I_cp I_rs = O_tgs, ort(I) period(year)". Put blank before and after the punctuation "=".