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 Post subject: Need assistant with calculation setPosted: Mon, 13 Feb 2012 15:18:01 UTC
 S.O.S. Newbie

Joined: Mon, 13 Feb 2012 14:46:32 UTC
Posts: 1
Hi All,

My task that i am trying to solve is to find the values that low frequency as well as far away from the remaining in most efficient way.

My data

---A1|A2|A3|A4| Frequency
P1| 0| 0| 0| 1| 4
P2| 1| 0| 0| 1| 6
P3| 0| 0| 1| 0| 3
P4| 1| 1| 0| 1| 1
------------------------------------
Avg_freq = 14/4= 3.5

I used the ave_freq to divide my data to High and low set
High where the frequency of pi≥avg_freq ( in our example P1 and P2)
Low where the frequency of pi<avg_freq ( in our example P3 and P4)

I solve the first problem which separate low frequency data from high frequency data. Then i used co occurrence matrix to find variance between high and low but i do not know how to include the frequency of p in the calculation.

---- P1|P2|sum
P3| 2 | 3 |5
P4| 2 | 1 |3

However, i have encounter two mathematical problems:
1: how to combine the frequency for high and low p in the calculation of variance.
2: Some low set maybe get high variance when comparing to high set but it is very close when we compare it low.

Please let me know if my idea is the correct in finding the low frequent and far away from other in very fast way. Do you have better solution.

Thanks a lot

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