An explanation of the term "Shared Houses"
Below is a table that shows the number of inhabited houses in My Database. Particular attention will be given in this paper to "Shared Houses".
I have used the shorthand S.H. to identify the "Shared Houses" in My Database. This term was not used by the enumerators. S.H.x identifies houses where 2 or more families were living in one house, but only one family name was given against each house. Within the database there are 957 S.H.x houses with 2 families; 43 S.H.x houses with 3 families; 7 S.H.x houses with 4 families and 5 S.H.x houses with 5 families. The 474 S.H.2 & S.H.2.1 houses all have 2 families living in each house. Here, there is a name given for each individual family occupying each "Shared House". You will also notice that S.H.3, 4, 5, 6 and 7 have a S.H.3.1, S.H.4.1, etc. This should become clearer when you look at the two examples below. Each example shows a copy of part of a microfilm page from the 1831 Census plus a copy of the same data as it is presented in My Database.
Below is a copy of a page  of part of Bishop Street which lay within the Bishop Street Ward of the City. The term outside means that it lay outside the City Walls. Note, in particular, the numbering of the properties 149 to 155. These were "Shared Houses" - one with 6 individual families - one with 4 families - two with 3 families and four with 2 families. Most of the properties in this street were "Shared Houses". Nos. 156 and 157 [Betty Lather and Thos. Gibson] were "single" houses. I have no idea how each "Shared House" was divided up. Was it regarded as a tenement or simply individual rooms in one house? This pattern of housing can be seen all over the City. Note that on this page the number of families living in a house is given as the total and is usually opposite the first name in the page and the corresponding house number. When the data from the microfilm page is added to My Database - there are blanks in the No. of Families Column. These add up to a total of c.1000 blanks. In some searches these blanks need to be included and in other searches they should not be included.
Below is a copy of a page  of Fahan Street in the Butcher Street Ward . Here the numbering and the way "Shared Houses" are identified is different. Here the enumerator puts a 1 against each individual family within a "Shared House". Initially, I diligently copied the 1s into my database. However, when I attempted to filter out "Shared Houses" from the total database, I got the impression that the figures resulting from various searches were simply wrong. This was because the 1s that you see below were difficult to isolate from the 1s that related to one family in one house. As you can see from the first table above, there were 37422 such houses. Thus the use of S.H.2.1 and S.H.3.1, etc. came into being and solved the problem.
I spent some time making sense of this data. The inclusion of a special column which identified "Shared Houses" came after a variety of methods had been used. I hope by this stage it makes some sense to you.
Also, you might find it useful to have a look at these two papers - Copies of some pages of Rural Townlands from the 1831 Census Returns and Copies of some pages of Urban Streets from the 1831 Census Returns. Originally, these two papers were produced before I "created" the "Shared House" column in My Database and then slightly modified to concur with the "Shared House" paper.
Copyright 2018 W. Macafee