ENGLISH 218 PURPOSIVE SAMPLING F: ECHANTILLONNAGE PAR CHOIX RAISONNE 8: MUESTREO DIRIGIDO A method of NON-PROBABILITY SAMPLING in which a sample is drawn to illustrate or represent some particular characteristic in the population. 219 QUADRATIC POLYNOMIAL F: POLYNOME DU SECOND DEGREE A DEUX VARIABLES S: POLINOMIAL CUADRATICA A commonly used algebraic form for PRODUCTION FUNCTION ANALYSIS. It involves only a constant and the first and second powers of the VARIABLE INPUTS (including cross-product terms). For example, for two independent variables X and Z, and a dependent variable Y, the quadratic polynomial can be expressed as 2 2 Y = b + b + b Z + b x + b Z + b XZ o 1 2 3 4 5 220 QUADRATIC RISK PROGRAMMING F: PROGRAMMATION QUADRATIQUE TENANT COMPETE DU RISQUE S: PROGRAMACION CUADRATICA BAJO CONDICIONES DE RIESGO A method of non-linear mathematical programming. It permits risk in ACTIVITY GROSS MARGINS to be taken into account. 221 QUESTIONNAIRE F: QUESTIONNAIRE S: CUESTIONARIO Interviewer's SCHEDULE or form with all questions listed word for word in the order they are expected to occur in the interview. 222 QUOTA SAMPLING F: ECHANTILLONNAGE PAR QUOTAS 8: MUESTREO POR CUOTAS A method of NON-PROBABILITY SAMPLING in which individuals with defined characteristics are selected until specified quotas have been filled. PAGE 43