| roughness | harsh or severe speech or behavior, men associate the roughness of nonstandard workinglass speech with masculinity, the roughness of her voice was a signal to keep quiet |
| crudeness roughness | an unpolished unrefined quality, the crudeness of frontier dwellings depressed her |
roughness
raggedness | a texture of a surface or edge that is not smooth but is irregular and uneven |
| harshness roughness | the quality of being unpleasant (harsh or rough or grating) to the senses |
derived function
derivative
differential coefficient
differential
first derivative | the result of mathematical differentiation, the instantaneous change of one quantity relative to another, df(x)
dx |
| regression coefficient | when the regression line is linear (y axb) the regression coefficient is the constant (a) that represents the rate of change of one variable (y) as a function of changes in the other (x), it is the slope of the regression line |
correlation coefficient
coefficient of correlation
correlation | a statistic representing how closely two variables co-vary, it can vary from - (perfect negative correlation) through
(no correlation) to(perfect positive correlation), what is the correlation between those two variables? |
product-moment correlation coefficient
Pearson product-moment correlation coefficient | the most commonly used method of computing a correlation coefficient between variables that are linearly related |
| multiple correlation coefficient | an estimate of the combined influence of two or more variables on the observed (dependent) variable |
biserial correlation coefficient
biserial correlation | a correlation coefficient in which one variable is many-valued and the other is dichotomous |
rank-order correlation coefficient
rank-order correlation
rank-difference correlation coefficient
rank-difference correlation | the most commonly used method of computing a correlation coefficient between the ranks of scores on two variables |
| coefficient of concordance | a coefficient of agreement (concordance) between different sets of rank orderings of the same set of things |
tau coefficient of correlation
Kendall's tau
Kendall rank correlation | a nonparametric measure of the agreement between two rankings |
phi coefficient
phi correlation
fourfold point correlation | an index of the relation between any two sets of scores that can both be represented on ordered binary dimensions (e.g., male-female) |
tetrachoric correlation coefficient
tetrachoric correlation | a correlation coefficient computed for two normally distributed variables that are both expressed as a dichotomy |
| hydrology | the branch of geology that studies water on the earth and in the atmosphere: its distribution and uses and conservation |
pitting
roughness
indentation | the formation of small pits in a surface as a consequence of corrosion |
| coefficient | a constant number that serves as a measure of some property or characteristic |
absorption coefficient
coefficient of absorption
absorptance | a measure of the rate of decrease in the intensity of electromagnetic radiation (as light) as it passes through a given substance, the fraction of incident radiant energy absorbed per unit mass or thickness of an absorber, absorptance equals minus transmittance |
drag coefficient
coefficient of drag | the ratio of the drag on a body moving through air to the product of the velocity and the surface area of the body |
| coefficient of friction | the ratio of the weight of an object being moved along a surface and the force that maintains contact between the object and the surface |
coefficient of mutual induction
mutual inductance | a measure of the induction between two circuits, the ratio of the electromotive force in a circuit to the corresponding change of current in a neighboring circuit, usually measured in henries |
coefficient of self induction
self-inductance | the ratio of the electromotive force produced in a circuit by self-induction to the rate of change of current producing it, expressed in henries |
coefficient of elasticity
modulus of elasticity
elastic modulus | (physics) the ratio of the applied stress to the change in shape of an elastic body |
coefficient of expansion
expansivity | the fractional change in length or area or volume per unit change in temperature at a given constant pressure |
coefficient of reflection
reflection factor
reflectance
reflectivity | the fraction of radiant energy that is reflected from a surface |
coefficient of viscosity
absolute viscosity
dynamic viscosity | a measure of the resistance to flow of a fluid under an applied force |
rowdiness
rowdyism
roughness disorderliness | rowdy behavior |
| choppiness roughness rough water | used of the sea during inclement or stormy weather |