Ashkenazic Shared DNA Survey: Data by Ashkenazic Percentage

An updated version of this post is here.

Thank you to everyone who has contributed data about shared DNA in people with Ashkenazic ancestry!  I have 4990 data points to analyze, and that should help the entire genetic genealogy community  (I'm still collecting data--you can find out more about the project and how to contribute here).

This iteration looks at how shared DNA will differ depending on how much (documented) Ashkenazi DNA each individual has.

There are four tables below:

• Table 1 looks at all 4990 data points, regardless of Ashkenazic percentage
• Table 2 looks at those data points where both individuals are documented to be 100% Ashkenazic
• Table 3 looks at those data points where one individual is documented to be 100% Ashkenazic and the other 50% Ashkenazic
• Table 4 looks at those data points where both individuals are documented to be 50% Ashkenazic

Table 1:  All responses (regardless of Ashkenazic percentage; 4990 data points)

Relationship	Number of submissions	Min total shared cM	Max total shared cM	Average total shared cM	Min largest segment	Max largest segment	Average largest segment
Parent/Child	180	3379	3730	3524.73	203.4	284.26	269.38
Siblings	186	2246	3037	2681.38	19.2	281.5	184.8
Half Siblings	31	1286	2167	1828.25	79.4	253.7	148.48
Grandparent/Grandchild	32	1368	2312	1852.11	92.4	263.7	181.07
Great Grandparent/Great Grandchild	7	618	1001	785.56	67	126	97.93
Great-great Grandparent/Great-great Grandchild	1	511	511	511	88	88	88
Uncle or Aunt / Niece or Nephew	220	671	2303	1782.82	35	268.8	124.88
Half Uncle or Half Aunt / Half Niece or Half Nephew	20	638.1	1317	934.22	64.8	161.5	112.06
Great-Aunt or Great-Uncle / Great-Niece or Great-Nephew	42	363.3	2034.6	899.05	27	237.6	93.18
Great-Great-Aunt or Great-Great-Uncle / Great-Great-Niece or Great-Great-Nephew	6	620.3	1019.5	855.52	52.1	107	74.83
First cousins	343	383	1475.4	922.91	18	221	83.76
First cousins once removed	493	61.2	1878	490.36	15	133.2	60.15
First cousins twice removed	83	0	537	259.27	0	108	45.22
First cousins three times removed	25	51.9	302.8	133.65	17	72.1	34.69
Half first cousins	18	192	841.2	514.1	24	150.7	74.22
Half first cousins once removed	37	63.7	389.6	264.08	23	114.6	52.94
Half first cousins twice removed	5	82.2	212	156.84	36	75.5	59.97
Half first cousins three times removed	2	34.7	54.8	44.75	9.2	10.4	9.8
Second cousins	771	42.4	698	273.91	6	423	47.6
Second cousins once removed	736	0	446	166.74	0	565.1	37.41
Second cousins twice removed	126	0	285.7	107.97	0	78.5	28.8
Second cousins three times removed	27	0	177	85.02	0	32	19.77
Half second cousins	88	30	313	153.59	11.8	85.5	38.02
Half second cousins once removed	96	0	243	88.96	0	63	24.33
Half second cousins twice removed	16	0	91.8	40.43	0	35.1	16.22
Half second cousins three times removed	3	30.5	47.9	39.2	12.3	22.8	17.55
Third cousins	397	0	315	115.14	0	91	26.66
Third cousins once removed	368	0	215	76.31	0	68	20.6
Third cousins twice removed	47	0	173	62.77	0	40.8	15.31
Third cousins three times removed	1	46	46	46	0	0	0
Half third cousins	70	0	101.9	30.04	0	32.1	9.37
Half third cousins once removed	21	0	79.3	17.65	0	18.8	5.07
Half third cousins twice removed	1	108	108	108	10	10	10
Fourth cousins	243	0	664	51.81	0	55.6	13.02
Fourth cousins once removed	106	0	146	35.05	0	41.5	10.11
Fourth cousins twice removed	7	0	102.4	58.57	0	31.2	10.87
Half fourth cousins	30	0	80.1	24.36	0	67.9	14.22
Half fourth cousins once removed	6	0	62.1	33.42	0	62.1	21.48
Half fourth cousins twice removed	1	109	109	109	6	6	6
Fifth cousins	31	0	116	29.7	0	22.5	4.82
Fifth cousins once removed	26	0	129.5	39.52	0	28.1	8.19
Sixth cousins	5	0	109.5	47.82	0	28	11.16
Sixth cousins once removed	6	0	113.8	76.47	0	32	17.07
Half sixth cousins	2	75	114	94.5	5	5	5

Table 2:  Both testers with known 100% Ashkenazi ancestry (3427 data points)

Relationship	Number of submissions	Min total shared cM	Max total shared cM	Average total shared cM	Min largest segment	Max largest segment	Average largest segment
Parent/Child	136	3379	3730	3521.02	203.4	284.26	268.07
Siblings	154	2246	3037	2687.44	19.2	281.5	185.26
Half Siblings	8	1754.1	2167	1999.74	101.6	253.7	151.63
Grandparent/Grandchild	15	1426	2215.1	1843.21	114.5	237.6	177.83
Great Grandparent/Great Grandchild	1	673.9	673.9	673.9	91.5	91.5	91.5
Great-great Grandparent/Great-great Grandchild	-	-	-	-	-	-	-
Uncle or Aunt / Niece or Nephew	173	671	2303	1792.05	35	223.7	122.87
Half Uncle or Half Aunt / Half Niece or Half Nephew	1	1171	1171	1171	-	-	-
Great-Aunt or Great-Uncle / Great-Niece or Great-Nephew	19	364	2034.6	870.28	27	237.6	91.83
Great-Great-Aunt or Great-Great-Uncle / Great-Great-Niece or Great-Great-Nephew	6	620.3	1019.5	855.52	52.1	107	74.83
First cousins	256	434.1	1473.2	924.58	29	167	82.31
First cousins once removed	389	61.2	1878	501.25	15	133.2	60.85
First cousins twice removed	37	167	439.4	276.83	14	79.1	45.08
First cousins three times removed	3	92	170.1	131.05	20.7	37.8	29.25
Half first cousins	10	192	841.2	497.32	24	150.7	69.7
Half first cousins once removed	32	89.8	389.6	271.94	23	114.6	55.97
Half first cousins twice removed	3	162	212	184.67	74.3	75.5	74.9
Half first cousins three times removed	2	34.7	54.8	44.75	9.2	10.4	9.8
Second cousins	562	42.4	698	281.41	13	423	47.63
Second cousins once removed	508	0	446	171.54	0	565.1	36.62
Second cousins twice removed	65	17.6	285.7	118.75	9.9	78.5	29.21
Second cousins three times removed	18	0	177	95.52	0	30.6	19.51
Half second cousins	61	30	257	152.97	11.8	85.5	37.67
Half second cousins once removed	54	8.2	243	97.16	8.2	63	23.83
Half second cousins twice removed	10	0	91.8	40.53	0	27.3	14.39
Half second cousins three times removed	1	47.9	47.9	47.9	22.8	22.8	22.8
Third cousins	285	0	315	122.76	0	91	26.28
Third cousins once removed	236	0	199	78.25	0	68	18.9
Third cousins twice removed	34	0	173	71.78	0	40.8	16.04
Third cousins three times removed	1	46	46	46	-	-	-
Half third cousins	21	0	101.9	45.75	0	17	10.95
Half third cousins once removed	5	0	79.3	34.58	0	15	8.18
Half third cousins twice removed	1	108	108	108	10	10	10
Fourth cousins	162	0	664	60.39	0	48	13.97
Fourth cousins once removed	72	0	146	40.37	0	38.8	10.21
Fourth cousins twice removed	7	0	102.4	58.57	0	31.2	10.87
Half fourth cousins	-	-	-	-	-	-	-
Half fourth cousins once removed	-	-	-	-	-	-	-
Half fourth cousins twice removed	1	109	109	109	6	6	6
Fifth cousins	28	0	116	25.81	0	14.8	4.01
Fifth cousins once removed	24	0	129.5	40.49	0	28.1	8.1
Sixth cousins	4	0	109.5	43.58	0	28	10.48
Sixth cousins once removed	4	0	113.8	78.45	0	27.8	14.6
Half sixth cousins	2	75	114	94.5	5	5	5

Table 3:  One testers with known 100% Ashkenazi ancestry and one with known 50% Ashkenazi ancestry(733 data points)

Relationship	Number of submissions	Min total shared cM	Max total shared cM	Average total shared cM	Min largest segment	Max largest segment	Average largest segment
Parent/Child	12	3383	3587.1	3511.92	263.7	281.5	271.81
Siblings	-	-	-	-	-	-	-
Half Siblings	16	1286	1960.4	1753.61	79.4	198.9	151.17
Grandparent/Grandchild	9	1368	2143.2	1792.42	147.36	263.7	192.95
Great Grandparent/Great Grandchild	-	-	-	-	-	-	-
Great-great Grandparent/Great-great Grandchild	-	-	-	-	-	-	-
Uncle or Aunt / Niece or Nephew	19	837.1	2155	1656.26	59	268.8	134.06
Half Uncle or Half Aunt / Half Niece or Half Nephew	13	771.7	1157.5	933.17	84.5	161.5	111.93
Great-Aunt or Great-Uncle / Great-Niece or Great-Nephew	10	363.3	1141	835.92	49.2	114	89.96
Great-Great-Aunt or Great-Great-Uncle / Great-Great-Niece or Great-Great-Nephew	-	-	-	-	-	-	-
First cousins	33	383	1217.6	939.47	52	145.7	84.19
First cousins once removed	59	109.8	844	436.53	29.5	109.55	59.28
First cousins twice removed	14	156	451.9	266.94	30	108	51.8
First cousins three times removed	2	96	105	100.5	17	17	17
Half first cousins	1	558	558	558	119	119	119
Half first cousins once removed	-	-	-	-	-	-	-
Half first cousins twice removed	1	148	148	148	36	36	36
Half first cousins three times removed	-	-	-	-	-	-	-
Second cousins	86	69.7	658.1	268.6	15	137.7	54.32
Second cousins once removed	98	21.5	433.4	155.19	12.8	122	40.63
Second cousins twice removed	26	30	248.7	96.6	8	55.1	29.66
Second cousins three times removed	1	95.5	95.5	95.5	5	5	5
Half second cousins	15	105	313	178.69	28.88	69	48.1
Half second cousins once removed	28	0	164	83.86	0	60.5	27.09
Half second cousins twice removed	6	8.3	78.3	40.2	8.3	35.1	20.33
Half second cousins three times removed	2	30.5	30.5	30.5	12.3	12.3	12.3
Third cousins	50	0	310	95.46	0	76	27.13
Third cousins once removed	60	0	215	72.25	0	67.4	23.61
Third cousins twice removed	9	0	103	40.1	0	28.03	11.9
Third cousins three times removed	-	-	-	-	-	-	-
Half third cousins	32	0	75.2	27.99	0	26	9.81
Half third cousins once removed	11	0	65.1	14.82	0	18.8	4.88
Half third cousins twice removed	-	-	-	-	-	-	-
Fourth cousins	47	0	131	28.45	0	43	9.03
Fourth cousins once removed	31	0	113.1	24.4	0	41.5	9.85
Fourth cousins twice removed	-	-	-	-	-	-	-
Half fourth cousins	30	0	80.1	24.37	0	67.9	14.22
Half fourth cousins once removed	6	0	62.1	33.42	0	62.1	21.48
Half fourth cousins twice removed	-	-	-	-	-	-	-
Fifth cousins	1	50	50	50	9	9	9
Fifth cousins once removed	1	40	40	40	10	10	10
Sixth cousins	-	-	-	-	-	-	-
Sixth cousins once removed	2	58	87	72.5	12	32	22
Half sixth cousins	-	-	-	-	-	-	-

Table 4:  Both testers with known 50% Ashkenazi ancestry (55 data points)

Relationship	Number of submissions	Min total shared cM	Max total shared cM	Average total shared cM	Min largest segment	Max largest segment	Average largest segment
Parent/Child	3	3445	3480	3464	-	-	-
Siblings	8	2260	2938.1	2614.26	141.2	220.7	186.51
Half Siblings	3	1650.9	1826	1722.8	124.2	184.5	154.8
Grandparent/Grandchild	-	-	-	-	-	-	-
Great Grandparent/Great Grandchild	-	-	-	-	-	-	-
Great-great Grandparent/Great-great Grandchild	-	-	-	-	-	-	-
Uncle or Aunt / Niece or Nephew	3	1674	1882	1744.67	126	126	126
Half Uncle or Half Aunt / Half Niece or Half Nephew	-	-	-	-	-	-	-
Great-Aunt or Great-Uncle / Great-Niece or Great-Nephew	-	-	-	-	-	-	-
Great-Great-Aunt or Great-Great-Uncle / Great-Great-Niece or Great-Great-Nephew	-	-	-	-	-	-	-
First cousins	5	854	1069	934.4	119.7	122	120.85
First cousins once removed	2	508.7	539.9	524.3	46.1	77.9	62
First cousins twice removed	-	-	-	-	-	-	-
First cousins three times removed	-	-	-	-	-	-	-
Half first cousins	-	-	-	-	-	-	-
Half first cousins once removed	-	-	-	-	-	-	-
Half first cousins twice removed	-	-	-	-	-	-	-
Half first cousins three times removed	-	-	-	-	-	-	-
Second cousins	5	199	455.3	297.6	46.8	97	69.8
Second cousins once removed	6	44	197.2	142.42	34.8	89.2	61.38
Second cousins twice removed	1	56.1	56.1	56.1	29.4	29.4	29.4
Second cousins three times removed	-	-	-	-	-	-	-
Half second cousins	-	-	-	-	-	-	-
Half second cousins once removed	1	68	68	68	39	39	39
Half second cousins twice removed	-	-	-	-	-	-	-
Half second cousins three times removed	-	-	-	-	-	-	-
Third cousins	1	232	232	232	0	0	0
Third cousins once removed	3	104	113	108.67	26	50	34.33
Third cousins twice removed	1	46.9	46.9	46.9	9.5	9.5	9.5
Third cousins three times removed	-	-	-	-	-	-	-
Half third cousins	1	57	57	57	12	12	12
Half third cousins once removed	-	-	-	-	-	-	-
Half third cousins twice removed	-	-	-	-	-	-	-
Fourth cousins	12	0	115.9	32.93	0	35.9	10.99
Fourth cousins once removed	-	-	-	-	-	-	-
Fourth cousins twice removed	-	-	-	-	-	-	-
Half fourth cousins	-	-	-	-	-	-	-
Half fourth cousins once removed	-	-	-	-	-	-	-
Half fourth cousins twice removed	-	-	-	-	-	-	-
Fifth cousins	-	-	-	-	-	-	-
Fifth cousins once removed	-	-	-	-	-	-	-
Sixth cousins	-	-	-	-	-	-	-
Sixth cousins once removed	-	-	-	-	-	-	-
Half sixth cousins	-	-	-	-	-	-	-

Note that some relationships don't have enough data to really do anything statistically.  But as more people enter data, perhaps they will reach that threshold.

And while I have data for people who have other known Ashkenazic ancestral percentages, there really isn't enough data from which anyone can draw conclusions, which is why I stopped where I did.

Remember, you can still contribute information about your own family's shared DNA to the project. Information on this project and how to participate is here.  Particular if you (or a known relative) has partial Ashkenazic ancestry, please contribute your data so that future posts can include additional Ashkenazic percentages.

Note:  I'm on Twitter.  Follow me (@larasgenealogy).

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