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# Copii

razdady212 Apr 22nd, 2019 77 Never
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1. copii = dlmread('copii.txt');
2. n = rows(copii);
3. inaltime = copii(:,1);
4. greutate = copii(:,2);
5. varsta = copii(:,3);
6. #subplot(1,1,1);
7.
8. plot(inaltime,greutate,'ro');
9. title('Dependenta dintre inaltime si greutate');
10. xlabel('Inaltime [m]');
11. ylabel('Greutate [kg]');
12. printf('coeficientul de corelatie intre inaltime si greutate : %f \n',corr(inaltime,greutate));
13.
14. x = inaltime;
15. y = greutate;
16. beta1 = (sum(x)*sum(y)-n*sum(x.*y))/(sum(x)*sum(x)-n*sum(x.*x));
17. beta0 = (sum(x)*sum(x.*y)-sum(x.*x)*sum(y))/(sum(x)*sum(x)-n*sum(x.*x));
18.
19. printf('\n Coef. de regresit: %f\n',beta1);
20. printf('\n Interceptia: %f\n',beta0);
21. hold on;
22. t = linspace(1.1,2.0,5);
23. title('Regresia liniara simpla');
24. plot(t,beta1*t+beta0,'-r');
25. grid;
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