TAX ADMINISTRATION 173 Nevertheless, the evidence seems to support the validity of an average ratio of approximately 55%. The data for 1929 shown in Table 51 indicate wide variations among the several counties. While the ratio computed from the combined data for thirty-nine counties is 559%, the ratios for individual counties range from 319% for St. Louis County and 36%, for Lawrence County to 729, for Pettis County. Although miscellaneous factors may have influenced the sales price, they could not account for such extreme variations. It can hardly be contended that the same standards of assessment are used in these counties, particularly when it is considered that an independent study made by the Missouri Bankers’ Association in 1925 showed ratios of 389, for Lawrence County and 789, for Pettis County. Other comparisons might be made, but they would serve only as corroborative evidence. When two independent studies show results so closely similar, there can be little doubt concerning the validity of the data. Although on the whole rural properties show higher ratios than urban properties, this is not uniformly true for all counties. Not all sales under unusual conditions could be eliminated from the data, and a factor such as this may account in part for the higher rural ratios for some counties. It is doubtful, however, that it could account for the wide difference between rural and urban ratios for certain other counties. Table 52 is a derivative table compiled from the same data used for Table 51. Again, there is no heavy concentration in the 50%, to 59% group. Only 17.2% of the total number of properties showed ratios between these limits, and only 20.8% of the total sales value fell within the 50% to 59% group. As in the case of the 1922 data, a large number of properties show ratios of more than 90% and less than 20%,. The extreme ratios in general are accounted for by relatively small properties. Charts 5 and 6 show the cumulative data in the lower part of Table 52 in graphic form. Thus, Chart 5 indicates that 4.49, of the total number of transfers show ratios of 100%, and over, that 59.39, of the total number of transfers show ratios of 509, or over, and that 1009 or all properties show