Population Line or Population Conditional Mean

Population Line: A population line is a line graph showing the relative population size of two or more different locations over a period of time. The data points in the chart are all connected by a straight line, and the line generally has an upward or downward trend that indicates the relative growth or decline of the population over the time period represented. Population Conditional Mean: Population conditional mean refers to the average values of a particular variable in the sample population, which are calculated after taking into account the fact that the population is segmented into various groups, based on certain conditions. It is important to note that the conditional mean is not the same as the overall mean. The conditional mean helps to identify any differences in the characteristics between different groups of the population.