chi-square distribution

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chi-square distribution

(ˈkaɪˌskwɛə)
n
(Statistics) statistics a continuous single-parameter distribution derived as a special case of the gamma distribution and used esp to measure goodness of fit and to test hypotheses and obtain confidence intervals for the variance of a normally distributed variable
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References in periodicals archive ?
Las variables categoricas se expresan como porcentajes y se han comparado mediante el Test de Chi2. Las variables cuantitativas se expresan como media +/- desviacion estandar y se utilizo la T-student para compararlas.
of 245 245 245 observations Adj R2 0.45 Prob > F 0.00 Wald chi2 241.12 Prob > Chi2 0.00 Treatment Effect Model Including a Poverty Dummy Variable Code 1st Stage 2nd Stage Participation Income (1) (5) (6) AGE 0.03 ** 0.04 ** AGE2 -0.00 ** HSIZE 0.11 0.09 *** PPL 0.66 -0.16 EDU 0.00 -0.02 ALAND -0.28 -0.03 STAY -0.01 0.01 ** MIGRANT -1.23 ** PALM 0.27 *** 0.14 *** RUB -0.03 0.07 *** OCROP -0.04 0.05 OPAGE 0.02 0.02 OPAGE2 0.00 0.00 OFFF -0.29 0.33 *** PLANTY 1 3.27 *** PLANTY2 1.68 *** PARTICIP 0.50 ** POOR -0.42 -0.28 *** POOR*PARTICIP -0.01 Constant -3.22 *** 8.33 *** Lambda -0.15 Rho -0.28 No.
Un test de correlation (Chi2) a cette fois ete effectue sur les regroupements des classes precedemment decrites (ceci afin de rendre la comparaison plus lisible) et ce pour chaque echantillon.
0.004 0.04 0.002 SELFEMPLOYED -0.381 ** -2.00 -0.147 UNEMPLOYED 0.111 1.04 0.044 AT HOME 0.152 1.27 0.06 STUDENT -0.168 -1.30 -0.066 RETIRED 0.357 *** 3.22 0.142 OTHER 0.443 ** 1.80 0.173 FISCAUT 3.433 *** 2.75 1.368 YEAR 1999 Number of observations 1797 Prob > chi2 0.000 WEIGHTED ORDERED 1999 PROBIT Coeff.
La comparacion de las proporciones de ovocitos madurados en cada uno de los grupos se realizo utilizando la prueba de Chi2. En el grupo tratamiento se obtuvo una tasa de maduracion de ovocitos del 73% y en el grupo control del 63%, no observandose una diferencia significativa entre grupos (P> 0,05).