======================================================================= MAPS-L ** MAPS-L ** MAPS-L ** MAPS-L ** MAPS-L ** MAPS-L ======================================================================= Date: Fri, 8 Apr 2005 From: Mary Larsgaard <[log in to unmask]> Subject: MAPS-L: RE: Records to Pieces Ratio It seems to depend upon: a. what kind of map collection one has: is it a general collection with a heavy topo-sheet population, or is it the map collection of an historical society? b. whether or not one analyzes monographic series. Several years back, I had to come up with some numbers for a retrocat project here at UCSB, and decided I wouldn't be analyzing monographic series until after the exact-match retrocat was done. So I used 1 title/10 pieces (which is what I also used when I worked at the Colorado School of Mines), and that's pretty close. Mary >======================================================================== > >MAPS-L ** MAPS-L ** MAPS-L ** MAPS-L ** MAPS-L ** MAPS-L > >======================================================================== > >Date: Fri, 8 Apr 2005 >From: Christopher Winters >Subject: Re: MAPS-L: Records to Pieces Ratio > >A survey I did a few years ago suggested that at the University of Chicago >Map Collection, there are almost exactly 5 sheets per title. The survey >assumed that monographic series (like the USGS I series) would be >analyzed, while sets of topos wouldn't be. I believe the survey was >statistically fairly sound. We used a large enough sample so that the >results are more than 99% likely to be accurate to within a few percent. >But different map libraries have very different collections. The U of C >Map Collection has a large number of one-sheet urban and geology titles. >Libraries where sets of topos constitute a larger proportion of holdings >will have a higher sheet-to-title ratio. > >Hope this is helpful. > >Chris Winters >University of Chicago Library > > > > >> ======================================================================== >> >> MAPS-L ** MAPS-L ** MAPS-L ** MAPS-L ** MAPS-L ** MAPS-L >> >> ======================================================================== >> >> Date: Fri, 8 Apr 2005 >> From: Jenny Marie Johnson >> Subject: Records to Pieces Ratio >> >> Hi. >> >> This probably is one of those questions that can't be answered -- >> although for some reason I vaguely remember reading or hearing a >> discussion about it. >> >> Is there any kind of ratio that can be expected for the number of >> bibliographic records to the number of pieces in a "typical," fully >> cataloged map collection? Is there any way of saying "Since we have >> x,000 pieces we can expect to find y,000 map records in the online catalog?" >> >> I'm not expecting there to be a truly scientific ratio! Commonsense, >> wisdom from the ages, or folklore/urban myth -- all ideas will be helpful! >> >> Thanks! >> >> Jenny Marie Johnson >> Map and Geography Librarian and >> Assoc. Professor of Library Administration >> >> University of Illinois at Urbana-Champaign >> > > >-- > > --