CORR — Correlation analyses of voice parameters, scatter plots
Computes correlation coefficients (such as Pearson product-moment
or Spearman rank coefficient) between recording days (repeated
assessments), experimental conditions, or the 2 corresponding
probands in a matched-pairs design. As an option, this program
generates scatter plots thereby including the 2 regression lines
y = y(x) and x = x(y). Such plots give a visual impression of the
range of inter-individual differences and of the stability of
individual parameter scores over time: all points lying along the
diagonal indicate perfect reproducibility, whereas, in the case
of less perfect reproducibility, the angle between the 2 regression
lines is inversely proportional to the correlation between the
2 recordings under comparison. The specificity of parameters can
be identified in a scatter plot through the shape of the point
"cloud": a "sausage"-shaped cloud along the diagonal indicates
a high specificity of the underlying parameter, whereas all points
clustering in a compact ball is an indicator of low specificity.
Specificationlist: CORR
------------------------------
I4 PROT 0 Default-value
I4 PLOT 0 Default-value
I4 PMAX 0 Default-value
I4 LPRT 6 Default-value
01 PROT Controls output to display/printer
02 PLOT Controls graphic output
03 PMAX Specifies maximum number of plot pages
04 LPRT Logical unit number of plot-device
05 DEMO Examples that illustrate program function
- PROT = 0: No print output
= 1: Simple statistics
= 2: Detailed analyses
- PLOT = 0: No plot output
= 1: Scatter plots, no regression lines
= 2: Scatter plots, single regression line
= 3: Scatter plots, two regression lines
- PMAX = q: Maximum number of plot pages
= 0: Unlimited number
- LPRT = q: Logical unit number of plot-device (standard=6;
valid numbers are 46-96)
- DEMO: Correlation between recording days, experimental conditions
Example
&&START GSELECT=Normative speech study zurich: ages 20-25 (study 600)
STUD=600,MODE=1,STAT=2,AMIN=20,AMAX=25,PROT=1,RSET=1,PROZ=10
POPU=AGE20-25
?
&&START GSELECT=Normative speech study zurich: ages 30-35 (study 600)
AMIN=30,AMAX=35,RSET=0
POPU=AGE30-35
?
&&START CORR=Normative speech study zurich (study 600)
PROT=1,PLOT=3,LPRT=66
&&START GSELECT=Normative speech study zurich: ages 20-25 (study 600)
STUD=600,MODE=2,ATAG=1,AMIN=20,AMAX=25,PROT=1,RSET=1,PROZ=10
POPU=AGE20-25
&&START GSELECT=Normative speech study zurich: ages 30-35 (study 600)
AMIN=30,AMAX=35,RSET=0
POPU=AGE30-35
&&START CORR=Normative speech study zurich (study 600)
PROT=1,PLOT=3,LPRT=66