Analyzing your GEDmatches 1

You have many of your DNA matches organized by chromosome now. You check the relative age of the matches by looking  at the SNP's (the fewer the SNP's, the older the match).  Should look something like this:

Ethnicity	Family	Name	Matching segments on Chromosome 5
1	F2	G H (Fxxxx)	2,253,150	- 5379138 (10.1653 cM) (1255 SNP)	5.2g
4	V4	JR (Mxxxxxx)	5,766,635	- 10038893 (9.3831 cM) (688 SNP)
1	V4	RJ (Mxxxxx)	6,327,436	- 14809567 (15.6823 cM) (1134 SNP)	4.9g
2	F2	LB (Fxxxxxxx)	6,330,738	- 14636006 (15.4373 cM) (2361 SNP)	4.9g
3	F2	NM (Fxxxxx)	6,330,738	- 14636006 (15.4373 cM) (2361 SNP)	4.9g
Eng	Riley	JC (F397260)	6,418,689	- 11359627 (11.1355 cM) (1661 SNP)	4.8g,  X-match
		JH  FTDNA	6,491,396	-14,334,126 (13.33 cM)
1	F2	AD (Fxxxxx)	32,689,955	- 43075280 (11.6895 cM) (2326 SNP)	5.1g
Ukr/Pl	Kozak	CS(Axxxxxx)	58,749,437	-67448240 (5.5 cM) (1,626 SNP)
5	F2	*JJ (A602566)	173,555,469	- 177472829 (8.91301 cM) (933 SNP)	6.4g

I don't have SNP's for JH, because that is info from FTDNA, and they don't supply that.  I don't have 'gens' for JR, because the relationship is under 700 SNP's that is GEDmatch's cut-off for estimating generations.  Its close though so I can 'guesstimate' 8 gens. 

     You'll notice that 3 people share DNA with me in about the same area that JC does.  JC's nephew was nice enough to answer my email and share with me that she has an ancestor named Riley, which is on of my ancestor's names.  Also JC is an Xmatch to me,  meaning the matching ethnicity must be English or Ukrainian, as I only have X contributions from those groups.  So I'm going to compare "one-to-one" these 4 with JC and see if they match to her too.

       So RJ - yes, 5.2 gens, LB - yes, 5.2 gens, NM - yes, 5.2 gens.

This is what I call "a cluster".  We may all have a common ancestor 5 -7 generations back.