MATLAB: Prediction based on previous historical data

statisticstoolbox

Hi, I have Historical data of "Start" and "End". Now, I have "Start" value, but want to predict "End" value. Can some one help me how to predict today's End value based on available Historical "Start & End" and today's Start value (to Predict Today End value). The day is of random type no correlation with time. Please help me some available models using MATLAB. Many many thanks in advance.
Historical Data:
 Start           End
  0.250   0.256 
  0.240   0.240 
  0.224   0.240 
  0.260   0.270 
  0.240   0.260
And Today Start value: 0.21 (Today End Value: 0.23)
Sincerely, Your's

Best Answer

You don't have enough points to infer any kind of regression. I mean, if you look at:
data = [0.25        0.256
        0.24         0.24
       0.224         0.24
        0.26         0.27
        0.24         0.26];
scatter(data(:, 1), data(:, 2));
there's no pattern to your data.
If you want to do a linear regression anyway:
polystartend = polyfit(data(:,1), data(:, 2), 1); %linear regression
todaystart = 21;
todayend = polyval(polystartend, todaystart)
gives
todayend = 0.22688
Related Question