Prediction based on previous historical data

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

Answer 1

[Guillaume]

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

[Mekala balaji]

Sir Thank you so much.

I have upper & lower bound: 0.005 from previous end value. If I predicted today's end is greater than 0005, then I want to restore the just previous end value as today's end value. In this case 0.26 (just for example. but in this no problem). I just want to set this boundary condition (constraint).So, how can I set this condition.

Many many thanks.

Answer 2

[Udit Gupta]

You can use mtlabs Curve Fitting tool (cftool). If you don't have that search for any linear regression or linear interpolation implementation on file exchange.

Answer 3

[KUMANAN KUPUSAMY]

can i use current data to predict previous data?