Timothy A Ebert

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Questions related from Timothy A Ebert

What is the interpretation of different measures of kurtosis?

I have been working in R and Excel. I have the following data: 23, 24, 36, 44, 2431, 543, 43, 25, 64. In R the kurtosis is 6.51838 and in Excel the kurtosis is 7.84453 (both programs give more...

08 August 2018 2,120 2 View

What sample size in transformed data?

I ran an experiment. I analyzed the data after log transformation. I got a non-significant result. I took the mean and SD from the transformed data and entered it into G*Power. The estimated...

04 April 2018 3,293 10 View

Does the Box-Cox transformation make studies more or less comparable?

Does a Box-Cox transformation make it easier or more problematic to compare the outcomes of multiple research projects? (Here is a hypothetical situation, if that helps to answer the...

11 November 2017 6,759 6 View

Using Back transformation

I have predicted crop yield as a function of two treatments, each treatment at four levels. The model does not work well, so I use a log transformation. I then calculate least square means and run...

07 July 2017 7,584 13 View

What do you do with a standard deviation or standard error?

When you read a scientific article, what do you do with the information when the authors report standard deviation or standard error? Do you care which is reported? Just to be clear: I already...

11 November 2015 7,228 15 View

Is it valid to do statistical analysis using data from monotonically increasing sequence?

I examine feeding behavior of an insect for several hours. One behavior is phloem ingestion. It has been postulated that the first instance of phloem ingestion is on average shorter than the...

11 November 2014 9,682 6 View