Statistical Analysis Stack Exchange
Statistical Analysis Stack Exchange

Questions tagged [representative]

51 questions
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Check if sample is representative of a larger sample

From a larger sample of tabular data, I have picked certain rows that meet a certain condition (this condition is unrelated to the actual data in the rows). Now, I want to know if the distribution of this subset that I have created is similar to the…
Debi
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How to make sure that the random sample is representative for the whole sample?

I have 14k tweets and I want to code these tweets (categorize them based on their topics), but since it is difficult to do the coding for the whole dataset, I decided to take a sample from it. What I am thinking about is to take a randomly selected…
Anas
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6
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How to check whether a sample is representative across two dimensions simultaneously?

I'm attempting to develop a standardized method to check whether one set of locations are representative of a larger set. In this particular case, I'm attempting to look specifically at their geographical representativeness. One method is to look…
Greg
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How to compare sampled areas to the Census?

I would like to discriminate sampled areas that are representative or not representative of their corresponding population, for a given characteristic. Suppose I have surveyed areas (i.e. Census tracts) within a given population area (i.e. county).…
Ellis Valentiner
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SPSS: "Weight cases" by multiple factors, by taking the product of weights?

My understanding is that a sample can be adjusted based on a known population using the "Weight Cases" function in SPSS. What is the proper procedure for weighting by multiple factors? Let's say I have WEIGHT_SEX and WEIGHT_ETHNICITY. Can I compute…
roboreb
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Is my data representative of Bristol?

I've got some data about people in Bristol. I have about 75,000 records. Part of my dataset is each respondants age. Aside from this, I have also downloaded census data for Bristol, which gives me the number of each in each age category i.e. 25000…
TheRealJimShady
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How can you evaluate the representativeness of a sample for a given distribution?

Problem: I am looking for a metric to find the representativeness of a sample for a given distribution, being the representativeness of a random sample as the degree of capacity of the sample to exhibit the characteristics of a sample that would be…
mcardoner
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Representative resampling

I am working with a population in which each individual has, among others, 6 observed variables that can be 0 or 1: $X_i \sim Bernoulli(p_i),\ i=1,...,6$ . I know the "true" value for the probability of success for each of the variables…
ami232
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How to interpret if my sample statistic is way out in the tail of the bootstrap distribution

I use bootstrapping to generate the distribution / histogram of my sample statistic and find out that the value of my real sample statistic is way out in the tail. What does this mean? Does it mean that my sample is unrepresentative of the…
Heisenberg
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Is my sample representative of the population I am trying to measure?

We have completed a survey of FTSE350 companies, but only received 49 responses. We assume that this response rate means that our results are not representative of the FTSE350 as a whole, but wanted to show this more scientifically. I'm sure this is…
Dan Johnson
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Measuring representativeness of a (non-random) selection

I am looking for a numerical value that expresses how representative a (non-random in this case) sample from a population is regarding the distribution of a certain attribute. Take for example, the age distribution in a country and in its elected…
Thilo
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What is the ideal population size so that its median is a representative statistical measure?

I am perfoming a robust z-score analysis to remove trends of temporal evolution of a certain variable so that I can compare different years. It is robust because there are outliers. My data is somehow a population. I am applying this method for each…
Seiji
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What is the number of subjects needed to be representative for a small, finite population?

I have been studying an organisation with 58 people with a number of Likert style questionnaires. The data are not random samples but rather incomplete census's. For the 6 questionnaires I managed to get between 49 & 57 respondents. However when I…
user14470
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How do I estimate error when I know a survey is not representative?

Let's say that I have a survey of $n = 1000$ respondents from a population of $N = 3000$. Moreover, it is known that the ratio of male to female in the population is $50:50$. However, in the sample, $70\%$ were female. Given that I know that the…
user64106
2
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1 answer

Conceptual definition between randomness, representativeness and bias in sampling

I was wondering if you can help me clarifying some concepts (if it is possible providing references to papers or books) that I will write in the form of ideas rather than questions. Consider this situation: we draw a stratified random sampling…
Mario GS
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