My home was burglarized a little over a year ago, so I will share some best practices for home security that were communicated to me by the police department.
1.) The best security system is a dog.
2.) It generally takes the police department (in my area) about 20-minutes to respond to a security system alert, and the smart burglars know this. That said, the average burglar is in and out within 10-15 minutes.
3.) For the not-so-smart burglars, security system stickers/signs are usually enough of a deterrent for them to move on to another house. Bottom line: get a sticker/sign and skip the security system.
4.) Most home burglaries today occur during the day, and not at night.
5.) Most burglars are opportunistic. If they are patrolling your neighborhood, and see you leave your house, they will take advantage of the opportunity.
6.) If you don't have a neighborhood watch program in your community and are concerned about security, you should check into starting one.
I also have other tips, if anyone is interested, but they are more home improvement related.