datas = Transpose[{advert, advertsquared, price, sales}]
{{1.3, 1.69, 5.69, 73.2}, {2.9, 8.41, 6.49, 71.8},
{0.8, 0.64, 5.63, 62.4},{0.7, 0.49, 6.22, 67.4},
{1.5, 2.25, 5.02, 89.3}, {1.3, 1.69,6.41, 70.3}, ...............}
As you can see this is just a sample.
Fitted model: 109.719 + 12.1512 adv - 2.76796 advsq - 7.64 prise
Everything works out so far, but now I want to plot the function, as well as the data points. I have seen that there are some examples already on the StackExchange network, however they are based on a simple regression, not multi. And the answers were so simple that I were not able to build on it to create what I wanted. Any ideas how to do this ?
StackExchange
. Frankly, I used Mathematica built-in functionality only once to perform a regression. I am using SigmaPlot to perform regressions as there are pre-defined options such as: Linear regression w/wo error bars w/wo data points w/wo. – Nikola Dimitrov Aug 20 at 12:28