increasing variance
[ɪnˈkriːsɪŋ ˈvɛːriəns]
noun phrase
variância crescente
1. A statistical or mathematical condition where the dispersion or spread of data points increases over time or across observations
The model showed increasing variance in the residuals as the predicted values became larger.
O modelo mostrou uma variância crescente nos resíduos conforme os valores preditos aumentavam.
2. In econometrics and time series analysis, a situation where the volatility or variability of a variable grows over successive periods
Increasing variance in stock prices during market turbulence indicates heightened uncertainty.
A variância crescente nos preços das ações durante a turbulência do mercado indica maior incerteza.
3. A violation of the homoscedasticity assumption in regression analysis, also known as heteroscedasticity
The diagnostic plot revealed increasing variance, suggesting the need for data transformation.
O gráfico de diagnóstico revelou variância crescente, sugerindo a necessidade de transformação dos dados.
This is a technical statistical term primarily used in academic, financial, and data science contexts in both English-speaking and Portuguese-speaking countries. It appears frequently in graduate-level mathematics, economics, and engineering courses. In Brazil, it is commonly encountered in econometrics courses and financial market analysis. The concept is universally understood among professionals working with quantitative data.
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