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September 1st, 2018, 06:04 PM  #1 
Newbie Joined: Sep 2018 From: United States Posts: 1 Thanks: 0  Statistics using Excel
I have been working on a project and it's been several years since I've taken statistics and I've never really used excel for this sort of stuff so I am uncertain if my process is correct. I'm hoping someone will be able to provide some guidance. I am working on something with tornado data and I am looking to determine if a certain period (could be a month, year, or season) is aboveaverage or belowaverage, and if so, how much above or below. To do this I was going to create standard deviations. In Excel, I have tornado data for all March's from 19501965. I used the average function to give me an average and then I used the STDEV.P function to yield some standardized number. (I'm hoping the STDEV.P function was the correct choice to choose). Anyways...so the average doesn't get skewed by any major outliers I want to see if there are any outliers so they don't get used to find the average and standardized number. So this is what I was doing. Using the QUARTILE.INC function I found the value for Q1 and then Q3. From here I did Q3  Q1 to get the IQR. I multiplied the IQR by 1.5. To find the lower quartile I did Q1  ((1.5)(IQR)) and to find the upper quartile I did Q3 + ((1.5)(IQR)) What I think I am confused with is don't you need to find the median or something and the data has to be in sequential order? As for getting the standard deviation what I did was take a value, subtracted it from the average, and then divided by the standardized number. For example... The March 19501965 average is 40.38 and the standardized number is 25.0471. March of 1966 had 12 tornadoes...so 12 40.38 = 28.38 > divided by 25.0471 = 1.13 so compared to the 19501965 average, March of 1966 was 1.13 standard deviations below average. Is this process/method correct? 

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