The East High Alumni Page: The ACT Concordance

The East High Alumni Page presents:

The ACT Concordance

In 1989 the ACT (American College Test) was revised in such a way that comparing the scores before and after the revision needed adjustment for a valid comparison. This chart provides that adjustment.

The concordance for old and new ACT scores, shown below, provides only a rough, full-point correspondence between the two sets. Sometimes 2 identical new scores correspond to 1 old score, and vice-versa.

Concordance of old and new ACT scores (pre-1989, labeled as "old" and post-1989, labeled as "new").

Old	New	Old	New
1	3	19	21
2	5	20	21
3	7	21	22
4	9	22	23
5	11	23	24
6	11	24	25
7	12	25	26
8	13	26	27
9	14	27	28
10	14	28	29
11	15	29	30
12	16	30	31
13	17	31	32
14	17	32	33
15	18	33	34
16	19	34	35
17	19	35	36
18	20

Source: American College Testing Program (1989)

To convert scores from new with greater precision (i.e., to a tenth of a point), we fit several curves to a plot of old and new data. The curve that fit best was a 4th-order polynomial (see figure C-1) , and we used it for the conversion.

(taken from: http://www.ed.gov/pubs/CollegeForAll/TableC1.pdf)

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Old	New	Old	New
1	3	19	21
2	5	20	21
3	7	21	22
4	9	22	23
5	11	23	24
6	11	24	25
7	12	25	26
8	13	26	27
9	14	27	28
10	14	28	29
11	15	29	30
12	16	30	31
13	17	31	32
14	17	32	33
15	18	33	34
16	19	34	35
17	19	35	36
18	20

Old	New	Old	New
1	3	19	21
2	5	20	21
3	7	21	22
4	9	22	23
5	11	23	24
6	11	24	25
7	12	25	26
8	13	26	27
9	14	27	28
10	14	28	29
11	15	29	30
12	16	30	31
13	17	31	32
14	17	32	33
15	18	33	34
16	19	34	35
17	19	35	36
18	20

Old	New	Old	New
1	3	19	21
2	5	20	21
3	7	21	22
4	9	22	23
5	11	23	24
6	11	24	25
7	12	25	26
8	13	26	27
9	14	27	28
10	14	28	29
11	15	29	30
12	16	30	31
13	17	31	32
14	17	32	33
15	18	33	34
16	19	34	35
17	19	35	36
18	20