Dear all,
I have a serier of index for 10 years.It is a Herfindahl index of concentration
and I would like to test if the change of this index over time is significant.
I am not sure how to translate this real problem into a statistics problem.Since
it looks like a decreasing trend,I used linear regression of index on year and
found the slope is statistically different from 0.But I am worrying about sample
size......
The indices are
year index
1993 0.149552855
1994 0.146646187
1995 0.143958559
1996 0.145009261
1997 0.147389484
1998 0.145309026
1999 0.144218297
2000 0.142834716
2001 0.140957544
2002 0.140444707
Thanks if anyone can give a clue.
Greetings,
Xiaoheng Zhang(Kevin)
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