by Diahan Southard | Oct 24, 2014 | 01 What's New, Ancestry, DNA, Jewish
Ancestry.com has improved the ability of AncestryDNA to find good matches for Jewish, Hispanic and other ancestries that maybe weren’t so precise before. Here’s the lowdown, quoted liberally from Ancestry.com’s press release:
The problem: Predicting genetic relatives among customers of Jewish and Hispanic descent and some other groups. “In DNA matching, we are looking for pieces of DNA that appear identical between individuals,” says the release. “For genealogy research we’re interested in DNA that’s identical because we’re both descended from a recent common ancestor. We call this identical by descent (IBD). This is what helps us to make new discoveries in finding new relatives, new ancestors, and collaborating on our research.”
“However, we also find pieces of DNA that are identical for another reason. At one extreme we find pieces of DNA that are identical because it is essential for human survival. At the other, we find pieces of DNA that are identical because two people are of the same ethnicity. We call these segments identical by state (IBS) because the piece of DNA is identical for a reason other than a recent common ancestor. This, we have found, often happens in individuals of Jewish descent.”
“The challenge in DNA matching is to tease apart which segments are IBD, and which ones are IBS….Most Jewish customers find that we predict them to be related to nearly every other Jewish customer in the database….Detecting which cousin matches were real and which ones were bogus has always been a challenge for these populations.”
First step toward a solution: “By studying patterns of matches across our more than half a million AncestryDNA customers, we found that in certain places of the genome, thousands of people were being estimated to share DNA with one another–likely a hallmark of a common ethnicity. Our scientific advancements… have allowed us to effectively “pan for gold” in our matches–by throwing out matches that appear to only be IBS, and keeping those that are IBD.”
“While the problem was more pronounced in customers of Jewish and some Hispanic descents, we observed this problem across all ethnic groups. So, all customers will see increased accuracy of their DNA matches, and significantly fewer ‘false’ matches.”
AncestryDNA results with better matches found by this method “will be available in the coming months,” says the release. They plan to email existing customers when results are ready.
by Lisa Cooke | Jul 30, 2014 | 01 What's New, Ancestry, Beginner, Book Club, Inspiration, Libraries, Research Skills
genealogy at the public library
This week, I’m researching at the Allen County Public Library in Fort Wayne, Indiana, which has one of the best public library genealogy collections in the United States. They’ve got more than half a million items on microfilm and fiche and 350,000 more in print. Among these items are nearly 50,00o city directories; 55,000 compiled family histories; most National Archives microfilmed military service and pension records….Okay, I’ll stop before you get jealous.
But in fact, MOST public libraries have some good genealogy resources. Have you checked out the library near you lately? OR the local history and genealogy collection in a public library near where your ancestors lived? You may likely find these 5 great resources:
- Access to paid subscription genealogy websites like Ancestry.com Library Edition, HeritageQuest Online, Fold3 and other genealogy databases.
- Local historical newspapers–or at least obituaries from them. ALSO access to historical newspaper websites like GenealogyBank.com which may have papers you’ll never travel to see in person.
- City directories, old maps and/or local histories for that town.
- Surname files. These aren’t at every public library, but you’ll often find them in libraries that have dedicated genealogy rooms. These likely won’t be neatly organized files with perfect family trees in them, but collections of documents, bibliographic references and correspondence relating to anyone with that surname.
- Other surprising local history resources. For example, my hometown library in Euclid, Ohio, has online collections of Euclid newspapers, history, yearbooks and oral histories!
What does your library have? Browse its website or call and ask about its local history and genealogy collections. You might even Google the name of the county with the phrases “public library” and “local history” or “genealogy.” Another branch of the same library system (not in your own or ancestor’s town but nearby) might have just what you need to find your family history!
Listen to the Family History: Genealogy Made Easy podcast by Lisa Louise Cooke. It’s a great series for learning the research ropes and well as refreshing your skills.
Want to learn more about doing genealogy at the public library? Check out two recently republished episodes of Lisa’s Family History Made Easy podcast:
Episode 34: Do Your Genealogy at the Public Library, Part 1 Genealogy librarian Patricia VanSkaik talks to us about researching at public libraries. She shares what kinds of things may be at the library (including unique resources), how to prepare for a visit and lots of great tips for making the most of your research time there.
Episode 35: Do Your Genealogy at the Public Library, Part 2 We go deeper into genealogy research at the public library. Genealogy librarian Patricia VanSkaik is back to talk about how to search an online library card catalog including advanced search methods, the unique collections that may be at public libraries, how to ask for exactly what we want, and the obstacles librarians face when it comes to cataloguing large and unique collections that may interest genealogists.
by Lisa Cooke | Jan 7, 2014 | 01 What's New, History, Maps
Partial image of Histomap of World History from Slate.com.
This might be the single most ambitious publication EVER: a chart that lays out the history of human civilization. It’s the ultimate infographic, created long before the era of the infographic!
What you see here is a partial image, a screenshot taken from a cool article on the 1931 Histomap: Four Thousand Years of World History.
It’s not perfectly accurate, it carries some cultural biases and ignorance of much of Africa’s rich history and the dates are given more as a range than anything. So what makes this a useful tool for genealogists?
We’re always looking for historical context: a way to understand how our ancestors fit into the “big picture” of history. Are you learning about a Portuguese or French line in your family? Learning by DNA tests that you have some deep Asian roots? Find these categories displayed on the map along with other dominant (or not-so-dominant) groups of your ancestor’s era. It’s cool to look at! Check out the entire map (and an explanatory post in this post by Rebecca Onion at Slate.com.
Genealogy Gems Contributing Editor Sunny Morton owns a book with a similar chart in it: Timechart History of the World (Timechart series)
The Timechart History of the World. The oversize, double-sided stiff cardboard pages fold out to more than 30 feet of full-color Victorian-decorated timecharts. She highly recommends it for the coffee table, if your coffee table is big enough to handle it!
Bonus: The Huffington Post has a neat article (with a photo) of another map from this series,The Histomap of Religion. (Time Chart of World Religion: A Histomap of Faith Through the Ages
) Religions can be tough to trace forward over time, as various sects divide or merge. Every tool helps!
