Optimize the weekly delay

clc; clear all; close all;
a=xlsread('C:\Users\Admin\Desktop\ArcSWAT_Install\26092021\Sir_RLR\RLR.xlsx');
car=a(:,2);
week_delay=14; %% I need to find optimum weekly delay number to give highest linear regression R square value
nvar=week_delay+1;
for j=1:nvar
p{j}=struct([]);
end
for w=1:nvar
p{w}=w:w+(99-week_delay-1);
end
for y=1:size(p,2)
combine(:,y)=car(p{y})';
end
input=combine(:,1:(size(combine,2)-1));
target=combine(:,size(combine,2));

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I am using linear regression app to find the best weekly delay value to give highest optimum R square value.

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