The population tag has no wiki summary.
56
votes
21answers
3k views
Locating freely available data samples
I've been working on a new method for analyzing and parsing datasets to identify and isolate subgroups of a population without foreknowledge of any subgroup's characteristics. While the method works ...
13
votes
4answers
2k views
Statistical inference when the sample “is” the population
Imagine you have to do reporting on the numbers of candidates who yearly take a given test. It seems rather difficult to infer the observed % of success, for instance, on a wider population due to the ...
5
votes
2answers
176 views
Combining the results of two surveys
Someone has surveyed a number of people and put the results in a database (Survey 1). Each observation has additional information that, for any subpopulation (men only, young only, etc.), gives a ...
9
votes
3answers
22k views
What is the difference between a population and a sample?
What is the difference between a population and a sample? What common variables and statistics are used for each one, and how do those relate to each other?
7
votes
3answers
394 views
Estimating population size from the frequency of sampled duplicates and uniques
There is a web service where I can request information about a random item.
For every request each item has an equal chance of being returned.
I can keep requesting items and record the number of ...
4
votes
2answers
878 views
Does transformation of r into Fisher z benefit a meta-analysis?
Usually r is transformed into Fisher z to test difference between two r values. But, when a meta-anlysis is to be performed, why we should take such a step ? Does it correct for measurement error or ...
3
votes
3answers
625 views
Identifying the population and samples in a study
I apologise for the silliness of this question. I ran an e-learning experiment using a class of undergrads. Participation was voluntary, so only half of the class participated.
I know that my sample ...
2
votes
3answers
611 views
Significance test for non-normal population?
I'm a journalist, and I am trying to work out whether hospitals that are in political districts with low majorities (i.e. where the political representative is fighting hard for his or her seat) are ...
1
vote
2answers
101 views
Population Variance and Sample Variance
How is it that lowering the number of frequence,$n$ by $1$ in the for formula for Population and Sample Variance account for the discrepency of using sample rather than population.
I mean how is ...
1
vote
1answer
76 views
Sampling distribution of means
Im working through a textbook atm and Ive read that the mean of "the sampling distribution of means" is the same as the "populations" mean.
To construct the sampling distribution of means, i need to ...
1
vote
2answers
61 views
Inferring a likely full population from multinomial measurement or survey data
Assume that we have one or several multinomial samples (e.g., surveys) taken from our population. While inferring characteristics (such as mean values, correlation, ...) from a multinomial sample is a ...
