# "Backed up" message/error!

Im using the following command: probit ownershp age marst race educ inctot

Where "inctot" (total income) = 9999999 when it is N/A

Because of this, when running probit, inctot skews the accuracy of the data.

I used the following command: drop inctot if == 9999999

But, as soon as i use that command, and try to use the probit command again (probit ownershp age marst race educ inctot). I get a "backed up" message.

Iteration 0: log likelihood = -50470.888

Iteration 1: log likelihood = -43215.584

Iteration 2: log likelihood = -40111.231

Iteration 3: log likelihood = -39706.314

Iteration 4: log likelihood = -39685.648

Iteration 5: log likelihood = -39684.552

Iteration 6: log likelihood = -39684.523

Iteration 7: log likelihood = -39684.523 (backed up)

Iteration 8: log likelihood = -39684.523 (backed up)

Iteration 9: log likelihood = -39684.523 (backed up)

Iteration 10: log likelihood = -39684.523 (backed up)

As long as i keep STATA open, the iterations continue with the "bakced up" message. The probit command works before droping inctot == 9999999, but as soon as i run that command, the "backed up" message starts appearing. Any help is extremely appreciated.