qualitative analysis

analysis /anal·y·sis/ (ah-nal´ĭ-sis) pl. anal´yses  

1. separation into component parts; the act of determining the component parts of a substance.

2. psychoanalysis.analyt´icanalyt´ical

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bite analysis  occlusal a.

blood gas analysis  the determination of oxygen and carbon dioxide concentrations and pressures with the pH of the blood by laboratory tests; the following measurements may be made: Po2, partial pressure of oxygen in arterial blood; Pco2, partial pressure of carbon dioxide in arterial blood; So2, percent saturation of hemoglobin with oxygen in arterial blood; the total CO2 content of (venous) plasma; and the pH.

gasometric analysis  analysis by measurement of the gas evolved.

gravimetric analysis  quantitative analysis in which the analyte or a derivative is determined by weighing after purification.

occlusal analysis  study of the relations of the occlusal surfaces of opposing teeth.

qualitative analysis  chemical analysis in which the presence or absence of certain compounds in a specimen is determined.

quantitative analysis  determination of the proportionate quantities of the constituents of a compound.

pulse-chase analysis  a method for examining a cellular process occurring over time by successively exposing the cells to a radioactive compound (pulse) and then to the same compound in nonradioactive form (chase).

spectroscopic analysis , spectrum analysis that done by determining the wavelength(s) at which electromagnetic energy is absorbed by the sample.

transactional analysis  a type of psychotherapy based on an understanding of the interactions (transactions) between patient and therapist and between patient and others in the environment.

vector analysis  analysis of a moving force to determine both its magnitude and its direction, e.g., analysis of the scalar electrocardiogram to determine the magnitude and direction of the electromotive force for one complete cycle of the heart.

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qual·i·ta·tive analysis (kwl-ttv)

n.

The testing of a substance or mixture to determine the characteristics of its chemical constituents.

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qualitative analysis (qual anal)

Etymology: L, qualis, what kind; Gk, analysis, a loosening

1 (in chemistry) the study of a sample of material to determine what chemical substances are present.

2 (in research) the analysis and interpretation of data that cannot be analyzed by statistical methods. Compare quantitative analysis.

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analysis

separation into component parts.

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cohort analysis

the separation of each of two cohorts into component parts and comparing the results.

current analysis

analysis performed on contemporary data.

discriminant analysis

a form of multivariate analysis in which the objective is to establish a discriminate function. The function (typically a mathematical formula) discriminates between individuals in the population and allocates each of them to a group within the population. The function is established on the basis of a series of measurements or observations made on the individuals.

economic analysis

evaluation of the costs and benefits of a commercial enterprise that takes into account additional returns, returns no longer obtained, additional costs and costs no longer incurred, discounting of gains back to the time when the project began, and opportunity costs relating to potential profitability from alternative use of the investment.

factor analysis

a multivariate technique which analyzes the underlying structure of a set of data. It is useful in explaining observed relationships amongst a large number of variables in terms of simpler relations.

guaranteed analysis

declares the range within which nutrients occur in a manufactured animal food.

multivariate analysis

techniques for the study of simultaneous variation in a number of variables. Includes linear discriminant functions, cluster analysis and factor and principal component analysis.

path analysis

a statistical technique for testing a limited number of causal hypotheses, the causal relationships between variables, by manipulation of one or more of the variables and predicting the outcome.

qualitative analysis

determination of the nature of the constituents of a compound or mixture.

quantitative analysis

determination of the proportionate quantities of the constituents of a compound or mixture.

regression analysis

a general statistical technique that analyzes the relationship between a dependent (criterion) variable and a set of independent (predictor) variables.

systems analysis

analysis of the interaction of a system, e.g. a biological system, often for the purpose of analyzing the differences between systems. See also system.

analysis of variance

a statistical method for comparing variables by partitioning the variance of the observations between the effects of the different variables and comparing it with the underlying random variation.

vector analysis

analysis of a moving force to determine both its magnitude and its direction, e.g. analysis of the scalar electrocardiogram to determine the magnitude and direction of the electromotive force for one complete cycle of the heart.