1970 HUNGARIAN CENSUS OF POPULATION Information on the data collection and processing (1977)

I. THE COMPREHENSIVE REWIEV OF THE DATA COLLECTION AND PROCESSING - 11. The control of the reliability of the census

The year of the construction of the dwellings As usual with the data of the dwellings, there are significant deviations also in the year of construction between the data of the census and the post-enumeration control. The data of percentage distribution can be well used here too, there is greater deviation only in years of construction before 1900; thus it is related to the years 1850-1899 (census: 17,81 percent, post-enumeration control: 19,46 percent, difference: - 1,65). However, our index-numbers very sensitive to differences hint at great possibilities of error. The gross error fluctuates between 18 and 104 percent by rubrics, on the average of the whole distribution it is 49, 52 percent. The net error is considerably reduced here too (4, 82 percent on the average of the absolute numbers), but in the rubrics of some years of construction it exceeds 10 and moreover 20 percent too. Table 12. INDEX-NUMBERS OF THE RELIABILITY OF DATA OF YEARS OF CONSTRUCTION Percentage distr. Difference between percentages Identically grouped items Gross Net Index of inconsistency Year of construction Census P.C. Survey Difference between percentages Identically grouped items errors Index of inconsistency Year of construction Census P.C. Survey Difference between percentages in the percentage of the census returns Index of inconsistency Before 1850 3,63 2, 82 + 0,81 36,92 103,94 + 22,22 1, 079 1850-1899 17,81 19,46 - 1, 65 69,23 70,83 - 9,28 0, 862 1900-1919 15, 22 15,12 + 0,10 58,85 81, 61 + 0, 68 0, 963 1920-1944 23,32 23,59 - 0,27 84,42 32,33 - 1,17 0,422 1945-1959 18,25 18, 56 - 0, 31 85,24 31,24 - 1,71 0,382 1960 1, 77 1,35 + 0,42 50, 74 75,00 + 23,53 0, 764 1961 3,40 3, 24 + 0,16 87,36 20, 69 + 4, 60 0, 214 1962 1, 91 1,87 + 0,04 82,99 31,97 + 2, 04 0, 326 1963 2,12 1,99 + 0,13 85,28 23,31 + 6,13 0, 238 1964 1, 69 1,71 - 0,02 79,23 42,31 - 0, 77 0,430 1965 2, 38 2,53 - 0,15 79,78 46,45 - 6,01 0,476 1966 2, 59 2,27 + 0,32 74,37 38, 69 + 12, 56 0, 397 1967 2,12 1,99 + 0,13 82,82 28,22 + 6,13 0, 288 1968 1, 37 1, 38 - 0,01 82,86 35, 24 - 0,95 0, 357 1969 2,42 2,12 + 0,30 84,95 17, 74 + 12,37 0,182 Total 100,00 100, 00 75,24 49,52 a

/ 4,82 b^0,

583 a/ The sum of the absolute numbers of net errors, compared with the total number of dwellings. - b/ Weighted arithmetical mean. In the first place it had to be taken into consideration in the judgement of the data that in 1970 a survey of dwellings was carried out and the year of construction was one of the data related to the dwellings. There are criteria - one of them is the year of the constimction of the building - which 112