Dear r-users,

I would like to investigate about how to fill in missing data.  I started with a complete data and try to introduce missing data into the data series.  Then I would use some method to fill in the missing data and then compare with the original data how good it is.  My question is, how do I introduce missing data in my complete data systematically like for example every 10th data will be erased and assumed as missing.  Here are some rainfall data:

125
130.3
327.2
252.2
33.8
6.1
5.1
0.5
0.5
0
2.3
0
0
0
0
0
0
0
0
0
0.8
5.1
0
0.3
0
0
0
0
0
0
45.7
43.4
0
0
0
0
0

Thank you so much for any help given.  I hope my question is clear.
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