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run regression, change the value of x and calculate how y changes, and then plot both

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alpedhuez
alpedhuez on 28 Jul 2021
Commented: alpedhuez on 28 Jul 2021
(Revised) Suppose I have a table T
y x1 x2
10 3 4
7 2 3
5 1 2
run a regression
mdl =fitlm([T.X1, T.X2],T.y)
Then I now want to calculate T.y1 for T.x3= T.x1-1 using the above fitlm formula
y x1 x2 x3
10 3 4 2
7 2 3 1
5 1 2 0

Accepted Answer

Image Analyst
Image Analyst on 28 Jul 2021
Use a for loop to alter T.X1
for numRuns = 1 : 10 % However many you want
x = [T.X1, T.X2];
mdl =fitlm(x, T.y)
% Plot stuff...
plot(x, T.y, '-');
grid on;
hold on;
% Now do something with mdl, like get T.y1.
% Now decrement T.X1 by 1 and do the next run.
T.X1 = T.X1 - 1;
end
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