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  Two years ago, my cofounder Justin came to me and told me that our listings data was a complete shit show. We were getting office space listings from landlords through email blasts, websites and phone calls. We were also getting office space listings from brokerages through different websites, emails, and phone calls. And everything […]

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By Jason Freedman
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  In May 2009, I walked into Y Combinator. My company, FlightCaster, had just gotten accepted and this was our intro session to the group. And kind of like the Dean of Admissions on the first day of freshman orientation, Jessica got up and recounted a bunch of stats about how cool our summer 2009 […]

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By Jason Freedman
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“The founder who handles fundraising should be the CEO, who should in turn be the most formidable of the founders.” -Paul Graham in his epic Fundraising How To guide for·mi·da·ble adjective  inspiring fear or respect through being impressively large, powerful, intense, or capable.     As a startup founder, the idea of pitching was always […]

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By Jason Freedman
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  I bet a lot of you remember that app called Tungle.me. It was a little startup that hooked into your various calendars and would allow people who wanted to make an appointment with you to self-schedule times in your open slots. It got all the little user experience pieces right such that I found […]

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By Jason Freedman
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I fucked up with one my co-workers here at 42Floors. I had to apologize and take it all back.  At least I was fortunate enough to have the opportunity.  My big transgression? I tried to tell him what to do.

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By Jason Freedman
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  I just had a crappy conversation with a good friend of mine. It’s the third crappy conversation I’ve had in the past week, so it’s probably time to write a post about this. My friend did Y Combinator with me, raising a-million-and-a-half with a good valuation from good investors. He’s now coming towards the […]

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By Aaron O'Connell
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tl;dr Sometimes we want to verify that a new design will convert at nearly the same rate as an old design. Split tests of this type are not intended to find conversion rate wins, but rather to ensure that the new design is not “too much worse” than the old design. Here, we demonstrate how […]

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Ever since we wrote that post where we trolled annoying recruiters, I’ve had quite a few conversations with entrepreneur friends about this subject.  Overwhelmingly, most of these founders said something along the lines of, “recruiters are just worthless.” Obviously, I could see why they would think so; I used to feel the same way. I […]

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By Aaron O'Connell
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tl;dr Split tests are a powerful way to determine if a new design has outperformed an old design. Here, we present the math necessary to empirically state the chance that a new design (branch B) is better than an old design (branch A). We walk through the problem with numerical simulations and present an approximate […]

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By Aaron O'Connell
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tl;dr Here we introduce the idea of statistical sampling uncertainty in the content of conversion rate optimization for website design. We begin by illustrating how successive trials of coin flips result in the binomial mass function. Then, we turn the problem on its head and show how to describe the conversion rate of a funnel […]

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