
Sample selection bias and presence-only distribution models:
... addition, the paucity of presence records for many species of interest makes discarding records unpalatable, and resources may not be available to conduct new surveys. The data may also be biased in a way that cannot be ‘‘fixed’’ by collecting new data: if many forested areas have been cleared, new s ...
... addition, the paucity of presence records for many species of interest makes discarding records unpalatable, and resources may not be available to conduct new surveys. The data may also be biased in a way that cannot be ‘‘fixed’’ by collecting new data: if many forested areas have been cleared, new s ...
PPS Sampling with Panel Rotation for Service Price Indices
... on services, SN conducts a panel survey for a sample of enterprises from the general business register (GBR). Initially, samples were drawn using a stratified simple random sampling design, with stratification by economic sector and size class (based on number of employees). Two developments have pr ...
... on services, SN conducts a panel survey for a sample of enterprises from the general business register (GBR). Initially, samples were drawn using a stratified simple random sampling design, with stratification by economic sector and size class (based on number of employees). Two developments have pr ...
Power laws, Pareto distributions and Zipf`s law
... To reveal the power-law form of the distribution it is better, as we have seen, to plot the histogram on logarithmic scales, and when we do this for the current data we see the characteristic straight-line form of the power-law distribution, figure 3 (b). However, the plot is in some respects not a v ...
... To reveal the power-law form of the distribution it is better, as we have seen, to plot the histogram on logarithmic scales, and when we do this for the current data we see the characteristic straight-line form of the power-law distribution, figure 3 (b). However, the plot is in some respects not a v ...
the need for probability
... We would like to emphasize a very important difference between classical and quantum mechanics. We have been talking about the probability that an electron will arrive in a given circumstance. We have implied that in our experimental arrangement (or even in the best possible one) it would be impossi ...
... We would like to emphasize a very important difference between classical and quantum mechanics. We have been talking about the probability that an electron will arrive in a given circumstance. We have implied that in our experimental arrangement (or even in the best possible one) it would be impossi ...
Ch4 - Qc.edu
... To find the mean of the variable y (we could call it x,) add all the values of the variable and divide that sum by the number of data values, n. ...
... To find the mean of the variable y (we could call it x,) add all the values of the variable and divide that sum by the number of data values, n. ...
Introduction to Sampling Theory
... A systematic sample is generated by choosing every nth item in a list of the population until the required sample size has been reached. A systematic sample of houses in a metropolitan area could be obtained by choosing every 100th house in a list of all houses obtained from an assessment authority. ...
... A systematic sample is generated by choosing every nth item in a list of the population until the required sample size has been reached. A systematic sample of houses in a metropolitan area could be obtained by choosing every 100th house in a list of all houses obtained from an assessment authority. ...