摘要:The stock exchange in Indonesia acts as a means of financial resources of business and investment
for the community. Any investor needs some profit from his/her investment. However, in determining
a policy for decision making, many investors do not always think, rationally. Moreover,
stock trading in the stock exchange/money market faces with high uncertainty, which may create
some irrational acts and leads to irrational investment decisions. This study aims to test the biased
investor’s behavior, such as overconfidence, disposition effect, and risk tolerance on investor’s
trading activities in the Indonesian Stock Exchange. To analyze the qualitative response variable in
this research, the researchers considered more than two categories. Therefore, the analysis required
was Multi-nominal Logistic Regression Model. Meanwhile, some investors appointed to be the
subject in this research were the customers of some Securities. The survey distributed 170 questionnaires
and collected 141 properly filled ones used in this research. The testing result employing
simultaneous multi-nominal logistic regression show that the overall model used was quite significant.
The testing conducted partially also shows that only overconfident investors were affected
by trading activities. Meanwhile, the opportunity of the overconfident investor to do trading was
considered to be moderate as much as 0.177 multiplied from the “infrequent” category.