Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

How to calculate car insurance quote
Former software developer at an insurance company here (not State Farm though). All of the above answers are accurate and address how the business analysts come up with factors on which to rate your quote. I wanted to chime in on the software side here; specifically, what goes into actually crunching those numbers to produce an end result. In my experience, business analysts provide the site developers with a spreadsheet of base rates and factors, which get imported into a database. When you calculate a quote, the site starts by taking your data, and finding the appropriate base rate to start with (usually based on vehicle type, quote type (personal/commercial/etc.) and garaging zip code for the US). The appropriate factors are then also pulled, and are typically either multiplicative or additive relative to the base rate. The most 'creative' operation I've seen other than add/multiply was a linear interpolation to get some kind of gradient value, usually based on the amount of coverage you selected. At this point, you could have upwards of twenty rating factors affecting your base rate: marriage status, MVR reports, SR-22; basically, anything you might've filled into your application. In the case of MVR reports specifically, we'd usually verify your input against an MVR providing service to check that you didn't omit any violations, but we wouldn't penalize for lying about it...we didn't get that creative :) Then we'd apply any fees and discounts before spitting out the final number. With all that said, these algorithms that companies apply to calculate quotes are confidential as far as I'm aware, insofar as they don't publish those steps anywhere for the public to access. The type of algorithm used could even vary based on the state you live in, or really just when the site code is arbitrarily updated to use a new rating system. Underwriters and agents might have access to company-specific rating tables, so they might have more insight at the company level.  In short, if there's an equation out there being used to calculate your rate, it's probably a huge string of multiplications with some base rate additions and linear interpolations peppered in, based on factors (and base rates) that aren't readily publicized. Your best bet is to not go through the site at all and talk to a State Farm agent about agency-specific practices if you're really curious about the numbers.