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tall_1
2010 Feb 12
2
Average of a variable against another.
Dear helpers,
FYI, I am a beginner of R, just have dealt with MATLAB or JAVA.
I want to know how to solve one problem given 4 variables: year_1, year_2,
tall_1, tall_2.
The tall_1 is measured at year_1 and tall_2 at year_2.
The tall has grown up such as uniformly 1 cm/yr.
The data is like
year_1 year_2 tall_1 tall_2
2007 2010 12 15
1999 2009 6 16
2003 2005 11 13
2002 2009 3 10
. . . . .
. . . ....