Histogram of median income in New York state
The mean of median income is 64403.3 (± 33402.4). And the histogram shows the distribution of median income meets the normal distribution, which means that the data owns a good quality.
Histogram of population density in New York state
The figure shows the mean of population density from all censuses is 64.046 (± 86.894) and its distribution in the statistic.
Comparison of maps of median income and population density in New York state
The distribution maps of median income and population density reveal the similar distribution of these two variables. To prove if there is a correlation between these two variables, we used a bivariate map and correlation analysis to explore it.
The figure below shows the median income and population density in New York state. From this map, we could see in the high population density areas (red area), there is a higher median income (bigger blue circle). By contrast, there is a lower median income (small blue circle) in the low population density areas (green area). The map shows a possible relationship between median income and population density.
Difference between living location and working location
The median income data are from households, which is based on people’s living location. However, the area (census tract area, country, city) of people’s living location may be different from the working location. As a result, even people living in areas with low population density, they may receive high income by working in areas
with a high population density. It is pretty possible especially considering that two situations: 1) census tract area is dived pretty small in the data we used, 2) lower house density in the wealthy community around cities.
More specific attributes of population density, such as education, age, and family size
In this research, we only explored the population density in one area, but we did not explore more attributes of population density, such as density of education, age and family size. It is important to know what attribute contribute more or less in population density, which could help us explore more deeply in the possible correlation between population density and median income.
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