# Uncategorized

## sMAPE

How to calculate sMAPE Subtract the actual value from the absolute forcast Square the result Find the square root of the previous result (step #2) sMAPE = Square Root ( F – A)^2 In general when comparing forecast methods, the smaller the sMAPE the better. <h2>How to calculate sMAPE in r</h2> <h3>Use the Metrics Package.</h3><p>Assume …

## Why is 2-tail p-value twice the 1-tail p-value?

Why is the two-tail p-value always twice the one-tail p-value in a t-test? In the t-test output below, notice that the two-tail p-value is 0.66852 while the one-tail p-value is 0.33426. The two-tail p-value is twice the one-tail p-value. Why is this true? The two-tail p-value is defined as P > |t|.  That is, the …

## 1 Test post

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## What is a Fireplace Worth

HomePrice Time Series Data

This is the Excel solution using slightly different values:

## What is the Correlation Coefficient?

This is an excerpt from a longer, 12-minute video by Unbreaking America. I used it as an example of regression on a current event. I wonder how many Americans are data savvy enough to understand what Lawrence is showing them. I asked my students to identify the predictor variable and the response variable and to …

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