My name is Stephanie and I worked as an adjunct professor of mathematics for Jacksonville University and Florida State College at Jacksonville before starting this site. This website was originally set up to help my students in STA2023 to understand elementary statistics. It’s since grown to cover AP Stats and calculus-based statistics. You’ll find help for SPSS, Minitab, Excel and other popular technology for stats. There are (as of January 2014) over 700 articles, videos, calculators and tables. and it’s still growing!

I earned both an MAT (Mathematics Education) and an MFA in Creative Writing. I’ve been teaching mathematics and statistics since 2006. I’m a member of both Pi Mu Epsilon (the mathematics honors society) and Kappa Delta Pi (education honors society). I attended the University of Florida and FSU where I took two additional years of coursework in education and mathematics education. My publishing credits include the Sirius Elementary Statistics textbook published by Houghton Mifflin, for which I was co-author.

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If you prefer an online interactive environment to learn R and statistics, this free R Tutorial by Datacamp is a great way to get started. If you're are somewhat comfortable with R and are interested in going deeper into Statistics, try this Statistics with R track.

# 13 thoughts on “About / Contact”

1. Joseph A Sierra

Thanks dear Stephanie. I’m in the process of getting my doctorate course in stats. I’m using SPSS ver 22 and its basically a big manual instruction for the app. The course is just that SPSS ver 22. thanks again. A Central FL fella. =)

2. Richard

Hello,

I only have Excel 2010 and I’ve been struggling for a few days now to find out HOW exactly to create a set of X random numbers (non integers) in columns based on a specific mean and standard deviation. So for example in 1 of 14 different data columns I need 543 different numbers generated where the mean of the sample on this single data field is 1.08 and the standard deviation is 1.76

I’ve looked at many confusing and inadequate solutions online and I’m not that technical so I’m kind of lost. The only thing I did that SEEMED like a fix but was ultimately an error was
=rand()/0.68+0.4. Here I had erroneously supposed that 1.76 was the upper limit of the standard deviation when in fact it was 2.84 and that the lower end was .4. Anyway, I’m more lost than when I started.

I would be SOOO grateful for a fix!

Thank you,
Richard

3. Andale Post author

Excel is very limited when it comes to stats.
I would use RANDBETWEEN and set it as 1.08-1.76 and 1.08+1.76.

Stephanie,

I signed up for the forum but have not received anything yet. I was going to post a question on methods for averaging or combining Kendall tau-b values. I have 576 of them that I calculated based on a questionnaire. I wanted to see if there is a valid statistically sound way of combining them to get the over all value and over all picture. Can you help?

Sincerely,

5. Andale Post author

Nima,
Seeing as the Kendall Tau gives you the correlation between two specific sets of data, I’m not sure combining them would be a good idea. In fact, I can’t think of any reason why you WOULD want to combine them as they are very specific, like Pearson’s. I guess you could take a mean. How statistically sound that it depends on what your original data is AND if your values are all positive or all negative.
S

6. Joel Witherspoon

Hi Stephanie,
I was attempting to purchase the book and guides but I was stopped with the messaged

“Error 1: User authentication failed”

7. Andale Post author

Thanks so much for reporting this. It was a connectivity issue which is now fixed.
Regards,
Stephanie

8. Andrew

I can’t post a question on a relevant page due to an error when I try, describing permissions.
http://www.statisticshowto.com/residual-sum-squares/

The question I was trying to post is:

“Find the Sum of Sq. for the following numbers: 3,5,8.
Step 1: Find the mean by adding the numbers together and dividing by the number of items in the set:
3 + 5 + 7 / 3 = 15 / 3 = 5”

I could be mistaken, but isn’t the mean of 3, 5, 8 = 16/3 = 5+(1/3) ?
From the first part of the equation “3 + 5 + 7 / 3 = 15” I believe there may be some sort of mistake? I think 3+5+(7/3) = 10+(1/3), not 15

9. Andale Post author

Thanks for your correction, Andrew. It was missing parentheses. I added these to clarify the mean (and changed 8 to 7).

10. Melissa

Hi Stephanie,

I like your tag line of “Statistics for the rest of us” and I’m interested in your thoughts on this application that is a more learner-centered tool for conducting and understanding statistics.

I look forward to your feedback.