ivprobit package - Error in chol.default(mat) : the leading minor of order 8 is not positive definite

I am trying to use an instrumental variable with a probit regression using ivprobit package. When I run the code, i have this error:

Error in chol.default(mat) :
the leading minor of order 8 is not positive definite

Do you know how to solve this problem? My code is:

ivprobit(Concluiu_Ensino_Superior ~ Idade +
Altura +
Raca_Cor +
Regiao +
Divisao_Rural_Urbano +
Estado_Civil +
Freq_Religiosa |Fec_Adole_18 |Idade +
Altura +
Raca_Cor +
Regiao +
Divisao_Rural_Urbano +
Estado_Civil +
Freq_Religiosa+ Se_teve_Aborto_Espon,PNS_2013_25_a_35_anos)

This topic was automatically closed 21 days after the last reply. New replies are no longer allowed.

If you have a query related to it or one of the replies, start a new topic and refer back with a link.