Hankel operators can be defined as integral operators ( H f ) ( t ) = ∫ 0 ∞ h ( t + s ) f ( s ) d s (1.1 in the space L 2 ( R + ) with kernels h that depend on the sum of variables only.
A PC is defined as a weighted sum of variables (genes).
The total sum of variables (artifacts, exogenous compounds and internal standards excluded) was calculated for each subject.
The total sum of variables was found to be significantly different between the group of FALS patients and the group of matched controls (p <0.05 for both set I and set II) as well as between FALS and SALS (p <0.05 for both set I and set II).
T-test was used to calculate p-values for the differences between i) ALS and control, ii) FALS and matched controls, iii) SALS and matched controls, iv) FALS and SALS and v) matched controls for FALS and matched controls for SALS of the total sum of variables.
The sum of variables (e.g., Y) was used to construct an ROC curve depicting the relationship between the sensitivity and specificity for a recurrence event.
Flexible models may better be able to capture such effects and changes that are weighted sums of variable responses to each spike.
A pattern of use, i.e. the outcome variable, was converted into a categorical variable: the sum of three variables was obtained (pill used for birth control purposes, doctor consultation obtained, and pill was prescribed).
Marginal costs were calculated by taking the sum of all variable costs and dividing the total variable costs by the number of consultations [ 10].
Logistic linear regression analysis through the origin assessed the magnitude of the net effect of each independent variable on the sum-score (dependant variable: resulted as the sum of independent variables) [ 18, 19].
The non-homogeneous ground profile is expressed as the sum of a variable mean and a zero mean random unevenness.
