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Questions tagged [survey-sampling]

Creating samples from a well-specified population (human: all adults; registered voters; individuals with diabetes; students of a university; establishment: all firms; firms with employment of 200 or more in New York City; resource: all land of a country or a state/province) using a probabilistic method, with the purpose of inference to that specific population

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4 views

Is sampling unit and the elementary unit in a survey design are same?

Actually I am having a question where there is asked to give example of these two but when I googled the examples, didn't got difference. From my understanding, elementary unit is the smallest unit ...
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25 views

Population vs Sampling Frame vs Sample

Could someone please explain how the sampling frame is different from population and sample? I understand that the population is all the sampling unit that match our criteria for the study. And the ...
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13 views

Can the range of possible values including the margin of error exceed 100%? [duplicate]

1) I'm working on a sample gotten from users on a website. However, on certain days, the sample size can be as small as 5. As a result, I used the T distribution for my calculations instead of the Z ...
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11 views

How does missing data affect analyses using svyset?

I am running some simple statistics using Stata and its svyset command. Does listwise deletion of cases during analyses affect the svyset? Are results still going to be weighted properly and the ...
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24 views

Design effect formula

I saw two formulas for design effect. One is deff = 1 + rho (n – 1) , where rho is the interclass correlation and n is the number of elements in the cluster. Another formula is defining DE or ...
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41 views

Calculating sample size for a stratified random sample

I have a total population of 4,000 farmers, divided into three unique regions. Approximately 50% of the farmers live in Region A (N=2,000), 27% in Region B (N=1,080), and 23% in Region C (N=920). I am ...
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13 views

Stratified Sampling: Given required bound, calculated $n_h$ is bigger than $N_h$?

I'm dealing with a question that has given me a peculiar result and I would like someone's opinion on how to deal this: Say you have a population of $N=550$ objects: $N_1=75$ red and $N_2=475$ blue. ...
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17 views

Web Based Survey Sampling method

I am doing a web based research with target audience as general public. I am a student and so due to limited resource, i basically did snowball sampling. I approached all those whom i knew, some ...
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16 views

when and where need deep stratification?

as working in sampling i understood some methods like, stratification and post stratification, as post stratification is good when simple random sampling provides underestimate results then we adjust ...
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Is this a valid interpretation of the General Social Survey?

https://donotlink.it/PAMW As some of you have probably noted by now, I am not inclined to suffer fools gladly. And the fools I am least inclined to suffer are those who are prone to smugly offer ...
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107 views

Why does weighted bootstrap have awful coverage even in toy example?

I'm interested in using the weighted bootstrap to correct for selection bias with a known form. I simulated a very simple example where the underlying data, $X$, are $N(0,1)$ and we are calculating a ...
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27 views

Regarding frequency and inverse probability weights

Deploying inverse probability weighting on a 3-group Setup, I examined for outlier activity, aswell deployed in a survey bin. Regression model. These estimates of ...
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11 views

Aggregation of surveys

I am doing an analysis of employee performance. And have two questions regarding sample size. (All calculations come from Survey Monkey’s Sample Size Calculator) Say an employee performs 500 tasks ...
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58 views

Sufficient sample size for skewed populations

I have measured 50000 individuals from a certain population, and 800 (~1.6%) of them have a certain characteristic (say green eyes). I can be pretty sure that this is an effect that is present in a ...
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1answer
47 views

log transform fixed PH in Cox model - how?

I have survival data to which I am fitting a Cox model with a continuous predictor. The cumulative martingale residual method (supremum test) of Lin, Wei and Ying suggested that both proportional ...
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18 views

What are the differences between Domain Estimation and Poststratification

Both of these two methods will firstly select a simple random sample without replacement and decide which groups these observations belong to and use ratio estimation to get quantities of interest. It ...
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25 views

Defining “variance” of a partially defined random variable

Elsewhere within CrossValidated the following survey sampling problem was mention. To each member $i$ of a population $\{1,\ldots,N\}$ there is assigned some value $c_i$ whose average $\mu=(c_1+\cdots+...
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1answer
81 views

Quota sampling in R

I was provided surveys with quotas set at the provincial, gender, and employment status levels. I was wondering if it is possible to use survey package in ...
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19 views

How to calculate percentages and ratios for weighted surveys

I have a data set from a survey conducted by an expert across several countries, as depicted below ...
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6 views

How do I incorporate raked weights into survival analysis confidence intervals?

I have some survey data with weights calculated using raking in order to ensure summary statistics are balanced with respect to the general population. I used the ...
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30 views

Benefit of scaling survey design weights

In the european social survey the design weights are scaled to the sample size (see quote and source): As with the design weights also the post-stratification weights are scaled to the sample size, ...
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23 views

NPS daily survey data

I have daily surveys sent to users of several of my organization´s services, the surveys consists only on NPS question (How likely would recommend X? on a 0 to 10 scale), number of respondents vary by ...
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How Much More Information (as bits) is Gained (if any) from a Ranking vs. Likert Scale Survey of 100 Questions's / 1-5 Scale?

All other sources of noise controlled, I, know that asking users to rank their preference on a collection of items from "best" (5) to "least" (1) in lieu of having them rate each one individually on a ...
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12 views

when is it ok not to weight a national database analysis

I am running an analysis using a national database that has weights available to produce national estimates. However, I am comparing 2 procedures that are very specific to research hospitals only. ...
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1answer
41 views

Testing change over time with different sampling frames

In 2017 a representative sample survey of 400 schools was conducted with a stratified two-stage sample design. The sampling frame was an earlier school census. In 2018, a second round of the survey ...
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Predicting elections with a random sample

If I have a population of exactly 100.000 voters, and I know they all voted in either candidate A, B, C, D or E. (e.g where the results of a random sample of 100 voters are A = 40%, B = 30%, C = 10%, ...
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1answer
77 views

Is there a metric of representativeness in statists?

In a group of 1000 people, where each of them is either A, B, C, D or E (no one can be more than one thing). If I have exactly 200 people with each trait (20% per trait), when I take a random sample ...
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291 views

Combining multiple survey datasets with design weights in a single model

The analysis of survey data with design weights is a difficult topic. In my case, I am working with two datasets: 1) NHANES data, which makes use of cluster sampling and stratification, and 2) Survey ...
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89 views

R Survey Package and One Stage Cluster Sample

I have a data set with 450 clusters of unequal size. I wish to select a probability proportionate sample of clusters with replacement (PPSWR) and measure an attribute within each of the sampled ...
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23 views

How does Rassumsen always get Pro-GOP Results?

(HONEST question, I am not being snarky) Not why, that is obvious…but how?? Even FOX polls skew more non-right wing! Their methodolgy seems otherwise quite fit, and it is a national poll (i.e. not ...
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Non-response bias and margin of error for product feedback

If 1,000 people received a household product and later they were emailed a survey asking for their feedback, how would you avoid non-response bias? As an example, the survey would ask them to rate the ...
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113 views

Sample size for cross-cultural research

I am planning to conduct a study involving responses of people from two different countries. Is there any consensus or rule of thumb about the minimum required sample size to test for cultural ...
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25 views

What statistics can compare individual survey responses & others that were measured as a group (from which we need to extract individual responses)?

The organization I belong to studies indigenous populations through primarily survey research. One study for example aims to identify the relationship between culture and the evaluation of odors. We ...
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28 views

What do I do about unequal sampling probabilities for second-stage sampling units in a PPS sample?

Say that I am drawing a two-stage simple random sample. The first stage selectes a unit that is a cluster, the second stage selects units within the cluster. There are two different types of units ...
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1answer
135 views

Question about attributing change from a pre- to post- survey to the larger population if the respondents are different from time 1 to time 2?

I administered a front office staff customer service satisfaction survey anonymously to consumers at different mental health clinics. Then the front office staff at these clinics received a course ...
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1answer
28 views

Finding data clusters in single variable data set

I'm working with a data set and I am relatively un-versed in statistics / statistical terminology (my background is computer science) though I'm pretty techie and might know a bit more than some. I'm ...
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What is the effect of more than one chance of selection when sampling?

I am designing a clustered sample. Within each cluster there are 3 groups that will be sampled from - two at a higher rate than the other. The two subgroups that will be sampled at a higher rate are ...
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1answer
89 views

Using quantiles to estimate the parameters of a distribution: adjusting for unobserved extreme values

I with to estimate the parameters of a specified semi-infinite distributional family based on a sample drawn from that distribution. It is plausible that my sample median converges to the population ...
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30 views

Missing data are biasing sample

I'm working with a sample of 1,222 survey respondents. Given the length of the survey, many respondents did not complete every question. After removing observations with missing data, I am left with ...
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1answer
286 views

Sample Size when the sampling frame is small

I am sure this question has been answered, and may be obvious to those familiar with online surveys. But I am struggling with it. I am surveying a specific population (local leaders in a specific ...
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1answer
56 views

Multistage Survey Sample for Sock Color

Here is the setup: We want to estimate the proportion of people in a country who wear black socks versus not-black socks. We have 100 cities (primary sampling units) in the country. In each city ...
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1answer
42 views

Model to calculate the sample size if my error is in absolute values?

For a exercise I must calculate the sample size using the following formula: $$ n=\frac{\sigma^2Z^2}{e^2} $$ where $n$ is the sample size, $\sigma$ the standard deviation, $Z$ is the critical value ...
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62 views

How to deal with sample proportion that is biased?

Say you want to give a survey to people from a population and assume that people who volunteer to take the survey are not necessarily representative of the population ("volunteer bias") and you don'...
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1answer
23 views

Find an estimate of the percentage of students failing in exactly one subject, and also find an unbiased estimate of its variance

The following describes summary statistics for performance in examination of a random sample of 50 students from a population of 250 students of a certain school. $$ \begin{array}{c|lcr} & \text{...
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324 views

Replicate weights and the Current Population Survey

The Current Population Survey’s Annual Social and Economic Supplement (abbreviated, oddly, as ASEC) is the USA’s longest running and most detailed annual survey of income and employment. Along with ...
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1answer
131 views

What do I do about inclusion probabilities >1 in PPS sampling?

I'm using a probability proportional to size method to draw a sample of clustered units. The distribution of the size variable is positively skewed, giving the largest units an inclusion probability ...
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198 views

Understanding svycontrast in R with simple random sampling

I'm taking a class on survey sampling and I have some problem understanding the R implementation of simple random sampling (SRS). Please look at this piece of code: ...
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1answer
22 views

Measuring the aggregate … “we” vs “I”

I am involved with a project measuring organizational behavior. My colleagues are split in terms of measures reading "we feel..." vs "I feel..." as the subject of the measurement. Personally, I ...
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1answer
124 views

Population proportion inference: what statistical error am I committing here?

I am struggling to understand the following paradox. Suppose we have a large population of people who exhibit different values of a trait, e.g. they are sick with different strains of a virus. ...
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1answer
430 views

Stratified random sampling when strata overlap

I am sure the title might be confusing, but here is what I am dealing with: I am running a survey at a health care center. The health center has around 15k active visitors. There are 5 departments ...