How to create dummy variable?
2 views (last 30 days)
Show older comments
Hi all, I have a data matrix of dimension 100x5(time series) I have an outlier for the 75th value of the 4th column so I decide to construct a dummy variable for this outlier.
How can I do this?
Thanks in advance for your consideration and any help
1 Comment
Muthu Annamalai
on 17 Jul 2013
Your question is not clear enough.
Do you want to find NaN values from your data? isnan maybe something you are interested in, to help pick NaN from data.
What is a 'dummy variable' ? Do you want to replace,
A(75,4) = 0 ; %eliminate the outlier ?
Accepted Answer
Iain
on 17 Jul 2013
Use the mean of the two "surrounding" points
A(75,4) = A(74,4) + A(76,4);
Fit a curve to the known points, and then evaluate it at that point: (or interpolate...)
p = polyfit(times([1:74 76:end]),A([1:74 76:end],4),4); A(75,4) = polyval(p,times(75)); & That uses a 4th order polynomial
0 Comments
More Answers (0)
See Also
Categories
Find more on Interpolation in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!