Dissemination areas are small area StatCan geographies, they are one
of the smallest aggregation level next to block faces which do not get shared publicly. While most are happy with DAs, we have noticed over the years that there is much data suppression in order to protect privacy, for instance, if the DA contains a high-rise apartment or condo building with a high population, and the location can easily be revealed, those data will not be made available. This is especially at issue when it comes to other demographic variables such as ethno cultural visible minority, language, income and so on, as the populations are smaller. Now, these are no longer census variables so it will be interesting to see how the survey data play out. Also, one of the asks is to have StatCan data aggregated into the geographies people know for instance neighbourhoods, wards, health districts, federal electoral districts, school catchment areas and so on. Those remain special & custom orders which are expensive indeed. For those of you who do not map data, the issues is that DAs or census tracts or postal code areas do not necessarily line up with these other more recognized geographies making a tangible and local analysis complex and expensive. The other ask is to have all gov departments agree on how to aggregate data so that we may compare data produced by different agencies and to have the framework/base geography files of the boundaries available for free so that we may insert the data in comparable ways. The Sunlight Foundation 10 principles of open data (http://sunlightfoundation.com/policy/documents/ten-open-data-principles/) should perhaps include the issue of data aggregation as well as interoperability. That would make for a dozen principles and would lead us to thinking more like an infrastructure. ---------- Forwarded message ---------- From: <[hidden email]> Date: 2012/6/27 Subject: JUNE 27, 2012 RELEASE: 2011 Census - Age and Sex: Census Profile for Dissemination Areas // DIFFUSION DU 27 JUIN 2012 : Profil du recensement pour les aires de diffusion sur l'âge et le sexe du Recensement de 2011 To: [hidden email] La version française suit la version anglaise. JUNE 27, 2012 RELEASE: 2011 Census – Age and Sex: Census Profile for Dissemination Areas As of 8:30 a.m. Ottawa time – June 27, 2012, the 2011 Census Dissemination Project is pleased to announce the official release of the Census Profile for Age and sex at the Dissemination Area (DA) level of geography. >From the many 'doorways' into Data products within the 2011 Census web module home page, users can click on the Census Profile link and access the product, now with DA-level information, in various formats including HTML, XML, IVT, and CSV/TAB. GeoSearch 2011 has also been updated to include direct links to the Census Profile. Users will now also be able to access the XML version of the updated Census Profile from the Treasury Boards Open Data Portal. Release of Product Content Structure Preview of 2011 Census Profile for Release 4 (Language) We are also pleased to announce the release of the content structure preview for 2011 Census Profile for Release 4 (Language). This content structure preview is available in HTML format only. Thank you. ********************************************* DIFFUSION DU 27 JUIN 2012 : Profil du recensement pour les aires de diffusion sur l'âge et le sexe du Recensement de 2011 Le Projet de la diffusion du Recensement de 2011 est heureux d'annoncer la diffusion officielle du Profil du recensement sur l'âge et le sexe au niveau géographique des aires de diffusion (AD) le 27 juin 2012 à compter de 8 h 30, heure d'Ottawa. Les produits de données sont accessibles par le biais de plusieurs portails de la page d'accueil du module Web du Recensement de 2011, dont le lien Profil du recensement, sur lequel les utilisateurs peuvent cliquer pour accéder au produit, qui offre maintenant l'information au niveau de l'AD en formats variés y compris HTML, XML, IVT, et CSV/TAB. GéoRecherche 2011 a aussi été actualisé afin d'offrir des liens directs vers le Profil du recensement. Les utilisateurs pourront dorénavant accéder à la version HTML de la version actualisée du Profil du recensement par le biais du Portail des données ouvertes du Conseil du Trésor. Diffusion de l'aperçu de la structure du contenu des produits du Profil du Recensement de 2011 en vue de la 4e diffusion (Langue) C'est aussi un plaisir d'annoncer la diffusion de l'aperçu de la structure du contenu du Profil du Recensement de 2011 en vue de la 4e diffusion (Langue). Cet aperçu de la structure du contenu est offert en format HTML seulement. Merci. Chantal Ripp Reference & Outreach Coordinator | Coordonnatrice des services de référence Microdata Access Division | Division de l'accès aux microdonnées R.H. Coats Building, 7th Floor, Section O, 100 Tunney's Pasture Driveway | Immeuble R.-H.-Coats, 7e étage, section O, 100, promenade Tunney's Pasture | Statistics Canada | Statistique Canada | Ottawa ON K1A 0T6 [hidden email] Teleph0one | Téléphone 613-951-3817 Government of Canada | Gouvernement du Canada -- Tracey P. Lauriault 613-234-2805 |
Then only thing I have to add to Tracey's comprehensive overview of Census geography is that we need to be cautious using DA level data in pure raw form. It does not allow for historic comparability as DA's change by each Census. Also by nature of suppression and random rounding, it is not always statistically reliable to aggregate DA level data into higher geographies manually such as neighbourhoods, as the resulting number would be undercounted. It is best to have StatsCan do such aggregation to omit the rounding and suppression factors and provide that FREE. :) SO.... it is not always as easy to just ask for and use low level raw data without understanding its statical reliability. ALL THE MORE REASON FOR META DATA to accompany data itself. I know the advocates would just prefer access to all data and I support that, but improper understanding and misuse without meta explanations can do more harm for the people we are trying to help. - Harvey Low
Harvey Low, MCIP, RPP
Manager, Social Research & Analysis Unit,
Toronto Social Development Finance & Administration Division, City Hall, 14th Floor E.,
>>> "Tracey P. Lauriault" <[hidden email]> 6/27/2012 9:40 am >>> Dissemination areas are small area StatCan geographies, they are one of the smallest aggregation level next to block faces which do not get shared publicly. While most are happy with DAs, we have noticed over the years that there is much data suppression in order to protect privacy, for instance, if the DA contains a high-rise apartment or condo building with a high population, and the location can easily be revealed, those data will not be made available. This is especially at issue when it comes to other demographic variables such as ethno cultural visible minority, language, income and so on, as the populations are smaller. Now, these are no longer census variables so it will be interesting to see how the survey data play out. Also, one of the asks is to have StatCan data aggregated into the geographies people know for instance neighbourhoods, wards, health districts, federal electoral districts, school catchment areas and so on. Those remain special & custom orders which are expensive indeed. For those of you who do not map data, the issues is that DAs or census tracts or postal code areas do not necessarily line up with these other more recognized geographies making a tangible and local analysis complex and expensive. The other ask is to have all gov departments agree on how to aggregate data so that we may compare data produced by different agencies and to have the framework/base geography files of the boundaries available for free so that we may insert the data in comparable ways. The Sunlight Foundation 10 principles of open data (http://sunlightfoundation.com/policy/documents/ten-open-data-principles/) should perhaps include the issue of data aggregation as well as interoperability. That would make for a dozen principles and would lead us to thinking more like an infrastructure. ---------- Forwarded message ---------- From: <[hidden email]> Date: 2012/6/27 Subject: JUNE 27, 2012 RELEASE: 2011 Census - Age and Sex: Census Profile for Dissemination Areas // DIFFUSION DU 27 JUIN 2012 : Profil du recensement pour les aires de diffusion sur l'âge et le sexe du Recensement de 2011 To: [hidden email] La version française suit la version anglaise. JUNE 27, 2012 RELEASE: 2011 Census – Age and Sex: Census Profile for Dissemination Areas As of 8:30 a.m. Ottawa time – June 27, 2012, the 2011 Census Dissemination Project is pleased to announce the official release of the Census Profile for Age and sex at the Dissemination Area (DA) level of geography. From the many 'doorways' into Data products within the 2011 Census web module home page, users can click on the Census Profile link and access the product, now with DA-level information, in various formats including HTML, XML, IVT, and CSV/TAB. GeoSearch 2011 has also been updated to include direct links to the Census Profile. Users will now also be able to access the XML version of the updated Census Profile from the Treasury Boards Open Data Portal. Release of Product Content Structure Preview of 2011 Census Profile for Release 4 (Language) We are also pleased to announce the release of the content structure preview for 2011 Census Profile for Release 4 (Language). This content structure preview is available in HTML format only. Thank you. ********************************************* DIFFUSION DU 27 JUIN 2012 : Profil du recensement pour les aires de diffusion sur l'âge et le sexe du Recensement de 2011 Le Projet de la diffusion du Recensement de 2011 est heureux d'annoncer la diffusion officielle du Profil du recensement sur l'âge et le sexe au niveau géographique des aires de diffusion (AD) le 27 juin 2012 à compter de 8 h 30, heure d'Ottawa. Les produits de données sont accessibles par le biais de plusieurs portails de la page d'accueil du module Web du Recensement de 2011, dont le lien Profil du recensement, sur lequel les utilisateurs peuvent cliquer pour accéder au produit, qui offre maintenant l'information au niveau de l'AD en formats variés y compris HTML, XML, IVT, et CSV/TAB. GéoRecherche 2011 a aussi été actualisé afin d'offrir des liens directs vers le Profil du recensement. Les utilisateurs pourront dorénavant accéder à la version HTML de la version actualisée du Profil du recensement par le biais du Portail des données ouvertes du Conseil du Trésor. Diffusion de l'aperçu de la structure du contenu des produits du Profil du Recensement de 2011 en vue de la 4e diffusion (Langue) C'est aussi un plaisir d'annoncer la diffusion de l'aperçu de la structure du contenu du Profil du Recensement de 2011 en vue de la 4e diffusion (Langue). Cet aperçu de la structure du contenu est offert en format HTML seulement. Merci. Chantal Ripp Reference & Outreach Coordinator | Coordonnatrice des services de référence Microdata Access Division | Division de l'accès aux microdonnées R.H. Coats Building, 7th Floor, Section O, 100 Tunney's Pasture Driveway | Immeuble R.-H.-Coats, 7e étage, section O, 100, promenade Tunney's Pasture | Statistics Canada | Statistique Canada | Ottawa ON K1A 0T6 [hidden email] Teleph0one | Téléphone 613-951-3817 Government of Canada | Gouvernement du Canada -- Tracey P. Lauriault 613-234-2805 _______________________________________________ CivicAccess-discuss mailing list [hidden email] http://lists.pwd.ca/mailman/listinfo/civicaccess-discuss |
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