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Help with REGR_SLOPE function

Posted on 2013-01-22
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Last Modified: 2013-01-27
I am trying to use the REGR_SLOPE function, but I am getting null values back from the function. I am probably making a simple mistake, but could do with some help understanding where I am going wrong:

SQL> select * from test_slope;

   SL_AGE    SL_MEAN
---------- ----------
         0      56.67
        20     292.33
        40        548
        60        713
        80     943.67

SQL> select sl_age, sl_mean, regr_slope(sl_age, sl_mean) 
over (partition by sl_age) "SLOPE" from test_slope;

   SL_AGE    SL_MEAN      SLOPE
---------- ---------- ----------
         0      56.67 
        20     292.33 
        40        548 
        60        713 
        80     943.67 

 

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I am expecting to get the following SLOPE values:

 SL_AGE    SL_MEAN      SLOPE
---------- ---------- ----------
         0      56.67       
        20     292.33      11.78
        40        548      12.28
        60        713      11.12
        80     943.67      10.97

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Question by:theskintman
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4 Comments
 
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Expert Comment

by:Amitkumar Panchal
ID: 38805056
check the below one..

select sl_age, sl_mean, regr_slope(100-sl_age, sl_mean)
over (partition by sl_age) "SLOPE" from test_slope;
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Author Comment

by:theskintman
ID: 38805073
That produces the same NULL outcome. What is your logic to doing "100-sl_age"?
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Accepted Solution

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theskintman earned 0 total points
ID: 38805288
Solved:
select sl_age, sl_mean, regr_slope(sl_mean, sl_age) over (order by sl_age) "SLOPE" from test_slope;

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Author Closing Comment

by:theskintman
ID: 38823769
I eventually worked it out for myself.
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