My display comand does not work

[Pau Vives]

I have a variable with a 1000 observation and I want to do an AR(1) regression. I already have used the arima variable, ar(1) command and it has worked perfectly. Now I wanted to test it with the reg variable L.variable, nocon with positive results. After that I used the predict variable_stde, stdp it states that 1 missing value generated, and if after it I use the display it does not show anything. How could I solve this?

Thanks in advance

[Andrew Musau]

and if after it I use the display it does not show anything. How could I solve this?

It's not clear what this means. If you want to see the observation, list it.

predict variable_stde, stdp
list if missing(variable_stde)

[Jared Greathouse]

I don't know what this means. Please show the exact code you used