Dear Stata experts,
For my master thesis, I'm figuring out how to analyse in order to measure environmental innovation patents.
I'm using IPC classes from the NBER dataset. But I struggle to prepare my data so if anyone can help me would be a blessing!
I want to keep a certain amount of different IPC classes which I use as environmental patents. But this means I need to get rid of all the other observations(patent types /IPC classes).
So I tried to do this with drop if, egen, bysort egen, but it all didn't work sadly. The tricky part is the IPC classes are string variables. I tried to use destring, but due to non-numeric observations (B01C example of a class) i can't use Destring or generate. I tried to fix this with force but this only gerenates dots, so I'm kinda lost how to proceed.
I need to sort and keep only a few specified IPC classes so I can merge that prepared data set with other data sets.
Thanks in advance and sorry if this is kind of a beginner/easy question.
Related Posts with Measuring environmental innovation patents
How could I handle the longitudinal (time-series) data? I provided an example below for an easy explanation for my question. I need to do survival anal…
Sum up # of observations and output to spreadsheet/csvHello, I am trying to accumulate the number of observations for each dataset with a pattern of "con…
stteffects commandHello, I'm working on the survival analysis, using stteffects command (both LAC-IPWRA and WAC-IPWRA…
Calculating growth & IndexI want to develop variable by s_id which reflect the growth & index of other variable. How can I…
check that rangestat is used correctlyHello, My data has the following variables: symbol (to identify which firm it is), year, industry a…
Subscribe to:
Post Comments (Atom)
0 Response to Measuring environmental innovation patents
Post a Comment