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最新版
AUXAL 3
相關軟體
LISREL
/
HLM /
AUXAL /
BILOG-MG
/
MULTILOG
/
PARSCALE /
TESTFACT
Fast,
comprehensive analysis of data from longitudinal growth studies
is now available on your desktop with the AUXAL program from SSI.
٠
Structural
Analysis with the BTT Model or the JPA2 Model
٠
Nonstructural Analysis by Fourier Transform of Residuals or
Kernel Smoothing
The program performs both structural and nonstructural
auxological analysis of human growth in standing height or
recumbent length. It provides accurate fitting or smoothing of
growth curves for height, velocity, and acceleration and
displays the height and velocity curves in publication quality
graphic output.
Maxima and minima of
velocity are located and described. Data from multiple cases can be
analyzed in one pass through the program and the results summarized
both longitudinally and cross-sectionally.
Employing Bayesian
methods of estimation, the program is able to fit the structural
models to incomplete longitudinal data. This facility makes it
possible to estimate a structural average curve for the full growth
cycle from mixed longitudinal data consisting of a sample of short
studies beginning at random ages. It also makes possible the
prediction of height at maturity, or any other age, from one or more
measures of height prior to maturity.
Special Features of
the AUXAL program
Data input
Program
controlled by an easy-to-prepare ASCII command file
Data
may be read from fixed-column or free-column ASCII files
Free-column fields may be selected from among other fields
anywhere in the data record
Data
for successive time points can be on separate records or on
one long record
Observations may be selected by age or height ranges in each
case
Cases from a
large study may be selected or omitted as specified on a
supplied list
Analysis
Structural analysis with the Bock-Thissen-du Toit (BTT)
model or the Jolicoeur-Pontier-Abidi (JPA2) model.
Nonstructural analysis by the Gasser-Müller optimal kernel
for smoothing of distance, velocity, and acceleration, or by
Fourier analysis of residuals from either of the structural
models.
Analytical description of maxima and minima of the growth
velocity curve of each case and of the structural average
curve.
Maximum
a posteriori (MAP) fitting of the structural models assuming
autocorrelated or uncorrelated residuals. Estimation of the
root mean square error after fitting or smoothing individual
case data.
Estimation of the generalized distance of each case from the
population centroid of the structural model parameters.
Case-by-case detail listings including observed heights,
empirical velocities, fitted or smoothed
Sample
problem input and output.
Sample
plots.
Technical appendix on structural and nonstructural analysis
of multiphasic growth.
Results
Cross-sectional means, standard deviations, standard errors,
skewness and kurtosis for height and velocity and height and
velocity residuals.
Sample
means, covariances and correlations of the estimated
parameters of the structural models.
Sample
means of the Fourier coefficients.
Smoothed percentiles of the sample distributions of height
and velocity.
Summary
of age, height, and velocity at the velocity maxima and
minima of all cases in the sample.
Analysis of the sample structural average curve.
Plots
The
plotting facility selects, displays and prints individual
growth curves for height and velocity.
Velocity maxima and minima identified on the plots.
Documentation
A 170-page User's
Guide includes:
Introduction to analysis procedures.
Data
layouts.
Command references .
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