Folks,

                This is probably a "help me google this properly, please"-type of question.

                In TIBCO Spotfire, there is a procedure called "line similarity". I use this to determine which observations show a growing, stable or declining pattern... sort of like a mini-regression on the time-line for each observation.

                So of the input is something like this:

Name Year_1_value Year_2_value Year_3_value
A 1 2 3
B 2 7 19
C 3 4 2
D 10 7 6
E 4 4 5
F NA 3 6

Then the desired output is as follows:
A Growing
B Growing
C Stable
D Declining
E Stable
F Growing (or NA is also fine)

                The data can also be unstacked, i.e. the three years could be separate rows if necessary.
                Is there a package for R that implements something like the above? I can obviously try do a set of simple regressions to classify the rows, but I want to gain from the thoughts and learnings of others who may have taken the time to implement a package.
                I tried searching with the words "line similarity" or its variants to no avail.

                Thanks in advance for your pointers!

Vivek Satsangi
GE Capital
Americas


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