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6.4

Trend analysis

Asked by gregoryyoung in MS SQL Server, Math & Science

Tags: trend, analysis, sql

I have some stat based data in a table ... I would like to query for ranges in an attempt to do some correlation.

EX:
Table measurements
pkMeasurmentId int
Subject string
Time DateTime
Value double

All values are between 0 and 1

my data has dips and troughs ... I would like to narrow these dips and troughs and get there size ...

ex:
....
....
.... trend coming down
1:00 .23
1:02 .27
1:03 .25
1:05 .29
1:07 .28
1:08 .31
1:09 .35
1:11 .41
1:12 .42
1:13 .45
1:15 .48
1:17 .45
1:19 .44
1:20 .42
1:21 .43
1:23 .39
1:25 .37

what I want to query for here is my large points of change in directionality (1:00 and 1:15) ... Yes I know I could use max and min if I wanted to specify an appropriate time window but I dont want to do this I want to find multiples of these types of numbers in the set (i.e. there can be 3-4 directionality changes in the set).

I know how to do this in code on my own using curve fitting but figured there might be a way to do this in SQL? as the data is already in SQL this would be a bit easier than me reading it out and doing libear calculations on it. Suggestions for linear analysis are welcomed as well (hence put in the math section)
 
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[+][-]07/06/07 10:45 PM, ID: 19436439Accepted Solution

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Zones: MS SQL Server, Math & Science
Tags: trend, analysis, sql
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Solution Provided By: harfang
Participating Experts: 3
Solution Grade: A
 
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