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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