Experiment Station Record, Volume 92, January-June, 1945 Page: 41
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19453 FIELD CROPS 41
days. Pigmentation occurred at the point of treatment, with drops of the androgen
in absolute alcohol. The minimum effective dose of testosterone so administered
was 1 jxg. distributed in equal daily amounts over 4, 8, or 16 days. The same response
was elicited by androsterone. Pigmentation was not induced by direct
application of progesterone and desoxycorticosterone in large amounts. The effect
of testosterone was not modified by the daily administration of 'estradiol. Crude
extracts of bulls' and boars' testes gave similar results on capons and pigmentation
of sparrow bills. The results were identical with those evoked by testosterone and
Overestimation of mean squares by the method of expected numbers, R. E.
COMSTOCK. (Minn. Expt. Sta.). (Jour. Amer. Statis. Assoc., 38 (1943), No. 223,
pp. 335-340).-"The actual subclass numbers in the data concerned [sex difference
in growth rate of swine] did not deviate significantly, as judged by chi-square, from
the expected numbers. However, the method of expected numbers by comparison
with that of fitting constants overestimated the mean square for the sex-litter interaction
by enough to have a bearing on interpretation of the results and the mean
squares for litters by a slight amount. The differences in results of the two methods
was interpreted to be the consequence of shifts in weighting squared deviations
associated with the shift from observed to expected numbers. This led to expected
results in reasonable agreement with those observed. The overestimation of mean
squares reported should not be interpreted as a serious defect of the method of
expected numbers. When the condition laid down by [G. W.] Snedecor for the
fit of expected numbers to proportionality is met, the maximum overestimation of
class and interaction mean squares is not large and the type of data for which a
very close approach to this maximum occurs should not be overly frequent. Certainly
the advantages cited by Snedecor when contrasted with the defect discussed
command the method for wide usage. What has been presented should actually
assist in judging in critical cases whether bias from the source considered is important,
thereby permitting increased rather than decreased confidence in the usefulness
of the method."
Analysis of variance for percentages based on unequal numbers, W. G.
COCHRAN. (Iowa Expt. Sta.). (Jour. Amer. Statis. Assoc., 38 (1943), No. 223,
pp. 287-301, illus. 1).-The following procedure is suggested: "Consider whether
one of the simplest methods of analysis (equal weights, equal weights within treatments,
equal weights within replicates) can be used without further investigation.
If in doubt apply the appropriate test. If none of the methods in [the above]
appears satisfactory, estimate the relative amounts of binomial and extraneous
variation from an analysis of variance of the fractions or percentages." Examples
are selected for the paper from the services and conceptions of six bulls in artificial
insemination tests. The more closely the weighted numbers approach the true
weights, the 'smaller is the disturbance of the z, F, and t values in levels of significance.
The recovery of inter-block information in quasi-factorial designs with incomplete
data, I, II, E. A. CORNISH (Austral. Council Sci: and Indus. Res. Buls. 158
(1943), pp. 22, illus. 1; 175 (1944), pp. 19).-This is a series of papers concerned
with the recovery of information in these designs.
I. Square, triple, and cubic lattices.-An approximate method for dealing with
square, triple, and cubic lattices is described, and the effect of the approximations
on estimation of adjusted treatment effects and their errors and analysis of variance
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U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 92, January-June, 1945, book, 1947; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc5064/m1/54/: accessed July 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.