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Questions tagged [representative]

The tag has no usage guidance.

0
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1answer
27 views

Evaluate Sample Representativeness of Dataset

I'm trying to check / evaluate how representative a sample is from a dataset. I'm interested in two things: Which sample best represents the original dataset Is the sample a "good enough" ...
2
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1answer
34 views

What is the ideal population size so that its median is a representative statistical measure? [closed]

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 ...
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0answers
25 views

How do I test if my sample of users is representative of the general population? [duplicate]

I have a sample of subjects. Each subject exclusively belongs to a category from 1–6. I also know how these categories are distributed across the general population. Consider the following plot: I'...
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0answers
23 views

Statistical Control vs. Sample Representativeness

Assume I have a sample that is NOT representative of the population. To illustrate an example, assume I the dependent variable called Violations that measures the number of job violations, and I ...
0
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1answer
629 views

How to check if a sample is representative of a population, across several criteria.

I have a total population of several hundred houses, which have different sizes, prices, and ages. I want to be able to select a random sample, of a few dozen or so houses, and test how ...
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0answers
9 views

Distributing weights such that sample is representative [closed]

So, i have the following samples containing each 100 observations. Sample 1 contains 4 groups - values in percent. Sample 2 contains 3 groups - values in percent. I want sample 2 to be scaled up or ...
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0answers
28 views

Representative sample

My question is about representative samples. My population is parents of children attending public autism-specific schools. I distributed paper-based questionnaires to all the parents in the public ...
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0answers
148 views

Raking to converting a convenience sample to representative sample

I have a convenience sample of patients in a ZIP Code Tabulation Area (ZCTA) for whom I know their gender and age. I also have census data for the ZCTA (in particular I have 1) the percentage of ...
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0answers
114 views

Relation between representativeness of a sample and sample size

Is there a relation between sample size and a representative sample? Does the sample size affect the representativeness of a sample? Context: I used cluster sampling to get a sample of the study ...
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0answers
45 views

Sample size calculation of a national study

We want to conduct a national study to estimate a prevalence of certain disease. we still confused about the sample size calculation and the criteria of selecting a representative sample. First: is ...
2
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1answer
52 views

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, $...
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0answers
35 views

Representative Sample - Air travel passengers and gender ratio

I have a question regarding the ways to build a representative sample for a research study focusing on air travel passengers in 3 different world regions (NA, EMEA, APAC) I think I should use the ...
1
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2answers
68 views

Questions on population and sample

As someone new to statistics, I had a debate with my supervisor today on the definition of population and sample in the following case. Suppose we track all new users (1,000 in total) that used an ...
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0answers
56 views

Proper way to determine that one sample is better (more representative of a known population) than another sample

Please excuse me if this has been asked before, I searched and couldn't find what I was looking for. The basic setup of my question is this - I have data on all of the students for a school. I then ...
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0answers
30 views

Deciding by RMSE how many simulation results to use for a representative sample

So, I'm doing a brute force Monte Carlo simulation to vary certain parameters and running a model through a thermal computational test bed. At the end I get temperatures for every hour. We have ...
0
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1answer
343 views

What type of MDS (Multidimensional Scaling) algorithm should I used?

Dataset for User-Page view, which represent in matrix, rows are Users (2000+ or more) and columns ( Pages may be 100+),entries represent frequency(number of time user visit that page), I would like to ...
0
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1answer
79 views

How can I calculate when a text corpus is representative of a language?

I am collecting and analyzing articles and other publications for building a text corpus. I'd like to know how to calculate when my text corpus is representative of a field. That is, how many texts, ...
0
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1answer
64 views

How to best represent a geographical area as point

I need to check a relationship(?) between land surface temperature (LST) and total population census tract (shapefile) wise where i am trying to relate social factors (e.g. total population, female ...
0
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1answer
71 views

Data management of a representative sample

In our original database there are some variables which are quantitative, but actually they are categorical variables. Our question is, should categorization be done in the original database or ...
1
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1answer
60 views

Sample Representing a Different Population

I have two sets of populations: containing 1.5 million and 5.5 million units. I need to select a sample out of 5.5 million population so that the sample represents the 1.5 million population based on ...
1
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1answer
328 views

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 ...
3
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1answer
182 views

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 ...
0
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1answer
154 views

How to calculate the randomness of a sample and if it is representative on r?

I am doing a project on R commander and the project says, "The set of exoplanets discovered to this day is a sample of all exoplanets that exist in the universe. Discuss whether you think this sample ...
2
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0answers
24 views

Hand-picked items in the training set, good idea?

The training, validation and test sets for the classification problem I'm working on were randomly sampled from real data. Because of this, I am fairly confident that there are representative. I want ...
2
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1answer
68 views

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 ...
5
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2answers
6k views

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 ...
3
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1answer
90 views

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 ...
3
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1answer
429 views

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 ...
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0answers
63 views

Finding a sample to represent a known population

Entire Population: 30,000 Known properties of population: Age, gender, height, weight, Ideal representative sample size: ??? This is for a mailing list test group selection. Problem constraints: ...
2
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1answer
1k views

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 ...
3
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4answers
18k views

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 ...
0
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1answer
210 views

I study subpopulation so huge that chi-squares test insists it is not representative. How do I get confidence intervals for my population?

I want to get results about population A. But all I can study is subpopulation C of B, where B is a subpopulation of A (that is, C $\subset$ B $\subset$ A). Each member of A is classified into one of ...
1
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1answer
308 views

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 ...
2
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2answers
180 views

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 ...
6
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3answers
13k views

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 ...