# Thread: Sig Test of Frequency

1. ## Sig Test of Frequency

Wondering how I approach this question....

Don't need it done for me (and it's not homework, btw)... but if somebody could point me in the right direction conceptually, I'd appreciate it...

There have been 6 perfect games in baseball the past 3.5 seasons, and 13 in the 90 seasons prior to that. I may not use test it under exactly those parameters (I may use x in last 10 years, y in past 75, etc etc). But I just don't know what tool I would use to to be able to say that we can be 'x' confident that an actual change has occurred versus just being random variation. It's been a while since college stats, and even then I don't recall testing the significance of a frequency distribution on it's own.... more like a frequency associated with a particular variable.

2. ## Re: Sig Test of Frequency

You might look into using a Poisson distribution. The intervals each have a rate, which is the mean of the distribution. From the distribution of one statistic you can calculate the probability of the other statistic occurring.

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