When engineers of all types are combined into one group, 5,821 cases become available for study. Dr. George W. Hervey evolved from detailed treatment and test of these data the following formula of wage increase which is easily applied and mathematically valid: Average wage $1,633.50+285.67 (years graduates) .2982 (years graduates) 3.2250. Table 58 gives the actual averages observed and the magnitudes yielded by application of this formula. = exponent TABLE 58.-Engineers distributed according to their present average annual salaries and the number of years since graduation, with normal salary values calculated from the data However, normal salary is not the exact salary for very many of the engineers studied. Variability of salary above and below the normal trend is the rule. Table 59 shows the calculated normal salary, average deviation from normal, average range, and the index of variation. TABLE 59.- Variability of the salaries of engineers about the normal salary trend The engineer who has been graduated only a year earns on the average an amount that falls within approximately $527 of normal salary or within a range of $1,054. The salaries of engineers having longer service show wider deviations which are covered by correspondingly larger spreads. What the increase in variability of salary according to years of experience means on a relative basis is demonstrated by the set of index values contained in the last column of Table 59. The indices are fairly constant for graduates of five years or less, then they rise with continuously greater velocity, attaining their high point in the case of graduates of 30 years' standing. 3 The salaries of the different types of engineers vary among themselves. The technical engineers, that is mining, chemical, architectural, hydraulic, aeronautical, research, and sanitary engineers, have distinctly higher salaries than the civil, electrical, and mechanical groups and they also increase at more rapid rates. Mechanical engineers who have been graduated 10 years earn more than the civil and electrical groups at the same period, but electrical engineers lead for both the 20 and 30 year graduates. Civil engineers are the poorest paid at each of the 10-year divisions. 3 The magnitudes in this column were computed in each instance by multiplying the average deviation by 100 and dividing by normal salary. Per cent TABLE 60.-Physicians and surgeons-distributed according to their present annual salaries and the number of years since graduation 0.24 1.94 14 10 17 2 22 4 17 1 2574475! 7 15 5 1340003 2727 1 35 8.47 10. 41 56 13. 56 7 70 16.95 23.97 12 81 19. 61 60. 53 9 6 14 65 15.74 76.27 TABLE 61.-Lawyers-distributed according to their present annual salaries and the number of years since graduation TABLE 62.-Dentists—distributed according to their present annual salaries and the number of years since graduation TABLE 63.-Clergymen-distributed according to their present annual salaries and the number of years since graduation TABLE 64.-Veterinarians--distributed according to their present annual salaries and the number of years since graduation 21 6.56 18 5. 62 94. 07 1 .31 100.00 TABLE 65.-Dietitians (women)-distributed according to their present annual salaries and the number of years since graduation $20,000 to $24,999. |