|
Index to site:
Search our site
Order
form
| |
Changes made in version 3.3 of BIOMstat
Changes to the
user interface:
Many important changes were
made. First, the program was upgraded to a 32-bit Windows 95/98/NT program.
This makes the program faster and permits much larger datasets to be analyzed.
The input line length is no longer limited to a maximum of 255 characters. The
help file was converted to a Windows 2000 style help file with a contents/index
window to its left. Graphics were also improved (3D plots where appropriate and
the saving and loading of plot options). Windows metafiles are now used to save
plots to disk and to copy and paste into other programs. These are usually much
smaller than bitmap files, have higher resolution, and can be edited using
other software.
The plot options window can be opened by right-clicking on a plot.
There is also a new built-in spreadsheet-like data editor.
The
datafile definition has been extended so that qualitative variables can be
included (their values can be alphanumeric). Excel XLS files can also be read
directly by most of the modules. Most of the modules allow one to select
subsets of the data to be analyzed. These are specified by selection filters. It
is also now possible to read in ascii files that contain just columns of data.
This is done by providing the name of such a file as part of a DTA file (the
filename is given on the same line as the data keyword).
Changes made to the
program modules
 |
Basic statistics: Added bootstrap estimates and
standard errors for the mean and coefficient of variation were added. |
|
Ancova: Added bootstrap estimate and
standard error for the pooled within-groups estimate of the common regression
slope. |
|
Comparison of means:
no change. |
|
Correlation: Added equal frequency ellipse and
ability to extend the PCA axes in the plot. |
|
Factorial anova: no change but a new module was
included to handle both balanced and unbalanced two-way anovas. |
|
Goodness of fit: no change. |
|
Homogeneity of variances: Added Levene’s test, randomization
test for Levene’ F, and a bootstrap estimate of the common variance. |
|
Isotonic regression: no change. |
|
Linear regression: Added a randomization test for b
and a bootstrap estimate of b and its standard deviation. |
|
Log-linear analysis: no change. |
|
Logistic regression: no change. |
|
Mann-Whitney U: no change. |
|
Mantel test: no change. |
|
Multiple regression: Added a randomization test for R²
and bootstrap estimates of the standardized partial regression coefficients.
Added 3D plots of the regression and the residuals. |
|
Nested anova: no change. |
|
Nonparametric tests of
association: add
plot of ranks. Uses table for Kendall rank correlation even if there are tied
ranks (but warns that probabilities are approximate in such cases). |
|
Polynomial regression: no change. |
|
RxC test: no change. |
|
Single classification
anova: Added a
randomization test for F and a bootstrap estimate of the variance
component. Sample sizes and means are displayed for each group. |
New modules
|
Two-way anova. Allows for model I, II, and mixed
model anovas. Permits unequal sample sizes (in which case it uses a general
linear model). Includes 2D and 3D plots to show the response of the dependent
variable to changes in the two factors. |
|
Non-parametric two-way
anova. Includes
Friedman’s method for randomized blocks, Wilcoxon’s signed-ranks test, and the
Scheirer-Ray-Hare two-way anova of ranks. |
|
Probability calculations: computes tail probabilities for the
Chi square, F, normal, and t distributions. |
|
Sample size estimation: estimates the sample size needed in
an anova in order to achieve a specified power for detecting differences
between two means (i.e., implements the methods of Box 9.14 of Biometry). |
|
An option was added to the
Options menu to display a "pocket calculator" window. It can be used
for simple calculations. |
Changes made to
BIOMedit
|
New features include a more
direct way to insert, delete, and sort variables. A more compact format so that
more of a data file can be viewed at one time. ASCII files and Excel files can be loaded into BIOMedit. You can now copy and paste between
BIOMedit and other Windows programs such as Word, Excel, Notepad, etc. |
|
In addition, a version of
the BIOMedit program was also built into the BIOMstat program itself. The built
in version is tightly coupled with the rest of BIOMstat so that any changes
made to the data are immediately available to BIOMstat. One can also disable
observations so that they are hidden from BIOMstat. Disabled observations can
also be displayed distinctively so that one can see which observations will be
effected by the variable selection filters in BIOMstat.
|
|
Exeter Software 
