![]() ![]() The first technique is to use a sliced fit plot. Given a function of two variables, f(x1, x2), I often visualize the graph of the function by using two techniques. Visualize slices of the wind chill surface Where T C is the air temperature in degrees Celsius, and V kph is the wind speed in kilometers per hour. The formula for the wind chill temperature in US units is However, you can fit a simple linear regression model that includes the main effects and an interaction term. Wind chill table are based on equations from physics and mathematical modeling. ![]() The wind chill calculations that are used currently in the US, Canada, and the UKĪre based on a 2001 revision of an earlier wind chill table. You can use the techniques in this article to visualize any response surface. This article describes how to use SAS to create line charts and heat maps that visualize the formula.įor the heat map, I show how to overlay numerical values and to choose colors for the numbers so that the text is more readable.Īn example of a wind chill chart is shown below. ![]() The formula uses two independent variables (air temperature and wind speed) to predict the wind chill temperature. I recently wrote about a simple statistical formula that approximates the wind chill temperature, which is the cumulative effect of air temperature and wind on the human body. ![]()
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