R - SQUARE is caluclating hurt when I did the math in the Excel spread sheet

Hi all

Any help is appreciated

I have a query that calculates the R_square for all 3 lines A

When I do the calculation of request for the 3 first lines is the correct calculation

Following lines set calculates wrong

I checked the calculation using the formula Rsquare Excel spread sheet

SELECT a.*,
       REGR_R2 (average, prof) OVER (ORDER BY rn
                                     ROWS BETWEEN CASE WHEN MOD (rn, 3) = 0
                                                            THEN 3
                                                       WHEN rn_desc = 1
                                                            THEN  MOD (rn, 3)
                                                       ELSE  0
                                                  END  PRECEDING
                                           AND CURRENT ROW) AS r_square 
FROM   (select b.*,
               row_number() over (order by b.a) rn,
               row_number() over (order by b.a desc) rn_desc
        from   tableaa b
       ) a
ORDER BY  a.a;

1     A     BEG     END     PROF     AVERAGE     REGION     RN     RN_DESC     R_SQUARE     Excel Formula(
2     1     0     0.1     159     159     1     1     14          
3     2     0.1     0.2     159     168     1     2     13          
4     3     0.2     0.3     179     159     1     3     12     0.25          0.25        =RSQ(E2:E4,D2:D4)
5     4     0.1     0.2     250     300     1     4     11          
6     5     0.2     0.3     320     250     1     5     10          
7     6     0.3     0.4     250     380     1     6     9     0.164520715     0.627906977 ===RSQ(E5:E7,D5:D7)
8     7     0.2     0.3     388     379     2     7     8          
9     8     0.3     0.4     379     388     2     8     7          
10     9     0.4     0.5     388     400     2     9     6     0.218256852     0.006756757 ==RSQ(E8:E10,D8:D10)
11     10     1.5     0.6     499     500     2     10     5          
12     11     0.5     0.6     420     448     2     11     4          
13     12     0.6     0.7     520     530     1     12     3     0.973538061     0.971560719 =RSQ(E11:E13,D11:D13)
14     13     0.7     0.8     540     550     1     13     2          
15     14     0.9     1     560     570     1     14     1     1          1           =RSQ(E13:E15,D13:D15)

When i do seperatly i am getting correct value what excel is showing

select REGR_R2 (average, prof) from tableaa
where a in (1,2,3)

REGR_R2(AVERAGE,PROF)
0.25


select REGR_R2 (average, prof) from tableaa
where a in (4,5,6)

REGR_R2(AVERAGE,PROF)
0.627906976744186

create table TABLEAA
(
  A       NUMBER,
  BEG     NUMBER,
  END     NUMBER,
  PROF    NUMBER,
  AVERAGE NUMBER,
  REGION  NUMBER
)
;

prompt Loading TABLEAA...

insert into TABLEAA (A, BEG, END, PROF, AVERAGE, REGION)
values (1, 0, .1, 159, 159, 1);
insert into TABLEAA (A, BEG, END, PROF, AVERAGE, REGION)
values (2, .1, .2, 159, 168, 1);
insert into TABLEAA (A, BEG, END, PROF, AVERAGE, REGION)
values (3, .2, .3, 179, 159, 1);
insert into TABLEAA (A, BEG, END, PROF, AVERAGE, REGION)
values (4, .1, .2, 250, 300, 1);
insert into TABLEAA (A, BEG, END, PROF, AVERAGE, REGION)
values (5, .2, .3, 320, 250, 1);
insert into TABLEAA (A, BEG, END, PROF, AVERAGE, REGION)
values (6, .3, .4, 250, 380, 1);
insert into TABLEAA (A, BEG, END, PROF, AVERAGE, REGION)
values (7, .2, .3, 388, 379, 2);
insert into TABLEAA (A, BEG, END, PROF, AVERAGE, REGION)
values (8, .3, .4, 379, 388, 2);
insert into TABLEAA (A, BEG, END, PROF, AVERAGE, REGION)
values (9, .4, .5, 388, 400, 2);
insert into TABLEAA (A, BEG, END, PROF, AVERAGE, REGION)
values (10, 1.5, .6, 499, 500, 2);
insert into TABLEAA (A, BEG, END, PROF, AVERAGE, REGION)
values (11, .5, .6, 420, 448, 2);
insert into TABLEAA (A, BEG, END, PROF, AVERAGE, REGION)
values (12, .6, .7, 520, 530, 1);
insert into TABLEAA (A, BEG, END, PROF, AVERAGE, REGION)
values (13, .7, .8, 540, 550, 1);
insert into TABLEAA (A, BEG, END, PROF, AVERAGE, REGION)
values (14, .9, 1, 560, 570, 1);
commit;

Published by: user1849 on 22 Sep, 2009 11:59

Published by: user1849 on 22 Sep, 2009 12:00

Hello

"The LINES BETWEEN PREVIOUS AND CURRENT LINE x" means that you do the math on a window containing x + 1 lines (previous lines plus 1 x current rank).
Most desired window is 3 rows, so the largest x should be 2.
Change the 3 literal returned by the expression BOX for 2:

SELECT a.*,
       REGR_R2 (average, prof) OVER (ORDER BY rn
                                     ROWS BETWEEN CASE WHEN MOD (rn, 3) = 0
                                                            THEN 2          -- Not 3
                                                       WHEN rn_desc = 1
                                                            THEN  MOD (rn, 3)
                                                       ELSE  0
                                                  END  PRECEDING
                                           AND CURRENT ROW) AS r_square
FROM   (select b.*,
               row_number() over (order by b.a) rn,
               row_number() over (order by b.a desc) rn_desc
        from   tableaa b
       ) a
ORDER BY  a.a;

The above call to REGR_R2 looks like something I wrote. If I told you to say 'THEN 3', I apologize.

Tags: Database

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R - SQUARE is caluclating hurt when I did the math in the Excel spread sheet

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