Questions tagged [descriptive-statistics]

Descriptive statistics summarize features of a sample, such as mean and standard deviations, median and quartiles, the maximum and minimum. With multiple variables, may include correlations and crosstabs. Can include visual displays - boxplots, histograms, scatterplots and so on.

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expected product price of a market - mean versus median [closed]

Let us say a product's price varies but it tends to be more expensive in the market. Let us assume the price distribution looks like this: Obviously the (arithmetic) mean would not be representative. ...
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Chi-square test for 7x2 [closed]

Am I violating any statistical assumptions/rules when I perform a Chi-square test on the following comparison. I have 7 groups and I have two outcomes (passed away or survived). It looks something ...
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calculation based on model output results different from descriptive results [closed]

I used the method of the top answer from this question on my own data. Interpreting the regression output from a mixed model when interactions between categorical variables are included The calculated ...
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What kind of tests would I need to run for this? [closed]

My hypothesis for the study is that if a person who was sexually abused is experiencing mental health issues they will also exhibit delinquency/substance abuse issues. My data consists of participant ...
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apply running median for non equidistance daily measurements with potentially several KPI measurements per day [closed]

Let us say I have daily measurements of a KPI with potential gaps (i.e. no measurements some days) and sometimes several measurements per day. How would one apply the running median (see for example ...
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Descriptive measures

What is the percentage of people who earned between Rs 75 and Rs 125? If the given frequency table is below:
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Alternative summary statistic for image resizing [closed]

I have a distribution of heights 90K images and I have the following statistical summary values: ...
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Is this the correct way to check for a heavy-tailed distribution?

I have two distributions and I want to test whether there's an inequality of variances. They're non-normal, so Levene's test is appropriate. The scipy implementation offers three options: test on the ...
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calculating chi-square [closed]

I need help with my homework. I am stuck on this for 2 hours and i don't know what to do. Start from the null hypothesis that this histogram can be described by a Continuous uniform distribution. ...
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Technical name/descriptor of statistical operation? [closed]

I have made a simple statistical operation and am looking for you help remembering the technical name for it. Its been a while since I did basic statistics. I have four datasets, each with four ...
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Resconstruct distribution from the first 4 central moments? (average, rms, skewness, kurtosis) [closed]

For a reasonably shaped (continuous) engineering curve, how well do the first four central moments (average, rms, skewness and kurtosis) describe the underlying shape? I have been wondering if these ...
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Assume that the variables x and y have a significant correlation [closed]

Choose the best answer for each of the followings, and justify your answer with logical argument: ...
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Elastic Net / Lasso as a solution to multiple comparisons and p-hacking? Inferential/Descriptive stats

I have a very large dataset, and I'm trying to find which variable(s) may describe the truth about a certain variable. I've considered just doing OLS on variables that make logical sense. But I've ...
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Differences in Factor Scores across subgroups

Suppose I have an item battery attempting to measure two contructs on two scales via multiple items. Suppose the survey is fielded in multiple countries. To discriptively assess the measure I could ...
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Is there a measure of the robustness of a statistic?

I got a question today when talking about mean and median, IQR and variance. Is there a numerical measure of the robustness of a statistic? I must confess that I had never thought about that before, ...
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Would a T test be appropriate for determining the significance of an algorithm's results?

Say you have an algorithm which should yield a higher score when given two similar images and a lower value when given two images that do not resemble each other. Two sets of tests are run, one where ...
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What is the sample space of this data set?

I have a dataset containing stock market closing prices. My teacher told me to define the sample space for this data set. She asked whether the sample space was discrete or continuous. Data: ...
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How to calculate probability of someone belonging to a group using descriptive statistics

I have data that looks like this: Group Avg Age Samples used A 36 380 B 0 80 C 48 160 D 72 100 E 32 280 What I would like is something that gives me the probability for each group on how likely ...
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261 views

doubts on what to consider when doing statistical tests

I am having some existential doubts on statistics; maybe someone here can help me clear out the dust. I've trying get answers from literature, but I found most reads quite vague, which still leaves me ...
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Different formulas of empirical variance

I came across two formulas of empirical variance. My professor used this one : $$ s^2=\sum_{i=0}^k n_i(x_i-m)^2 $$ with $m$ being the mean of the series. But it didn't make much sense to me and when I ...
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how can one create a correlation matrix for panel data?

I came across many papers that use a fixed effects panel data model and so I've done the same. However, they also provide a correlation matrix but don't explain how it is derived or how it differs ...
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How do I identify common features/similarities of members in a class?

If I need to go over the actual data which I have, I have employee data of our company. Employees are divided into two groups, binary(1,0). Some of them are 1 and the rest are in 0 class. The data set ...
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1answer
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Can we use descriptive statistics to make inference about the population?

In the below example we are using sample-mean to make a scientific guess about our population, i.e. using descriptive statistics to make conclusion(or inference) about our population. Is this correct? ...
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Best Statistical Test for Median Comparison [duplicate]

I just have a very quick question on some data I have. I was asked to collect data for tumor emergence in two groups of mice. One treated with PBS and another treated with PBS plus Matrigel. The one ...
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How to get the number of deaths per month in this dataset?

This dataset shows the number of deaths (of all causes) in the US in 2019. It's labeled in weeks. What is the right interpretation of this for getting the number of deaths in January? Should I add ...
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Variance Inflation Factor - can I make this assumption?

Let's assume I have a dataset with two numeric columns and I am assessing VIF for each variable: [x1, x2] Now let's assume that the calculation shows that variable <...
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Second of the seasonal difference in a time series

Please let me know how to do the second of the seasonal difference in a time series. For example, I have 7-day seasonality and I did the first and second differencing as follows. I got the following ...
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63 views

Large vs. Small Standard Deviation

I understand how to calculate the mean, variance and standard deviation of a given set of numbers, and I also understand the standard deviation is a measure of spread from the mean. In most texts (and ...
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Ranking metrics: weighted and different

I have 2 ranking lists and I want to see how similar are they between them. setA = {10,9,8 ,7 ,6,5,4,3,2,1} setB = {4,5,12,14,9,8,7,6,2,1} There are the following constraints: 1. High number (or if ...
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Finding the standard deviation with certain information

Is one able to get to a sample standard deviation with the following pieces of information? Mean, Median, Count, IQR We can assume it's a normal distribution.
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Why two different surveys will not give the exact same result?

I faced a challenge recently with our commercial team about our annual market survey result. As you can guess, our commercial team has no background in statistic or math etc. A brief introduction, ...
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Finding SD by only knowing the mean and one other piece of information

"The weights of bags of vegetables are approximately normally distributed with mean of 1kg. One quarter have weight greater than 1.1kg. Find the standard deviation." I know this question ...
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1answer
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PCA: axis of least inertia or of greatest variance

In this video, it is said that: The axis of least inertia [is the axis] of greatest variance. However, this link says the axis of least inertia is also the axis of ...
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How to write up the results of a zero-inflation poisson model?

I am currently running a series of zero-inflation poisson mixed effects models using the glmmTMB function of the package of the same name and was curious about how you would write up the results of ...
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Basic Statistical Tests in a Descriptive Research

I have very limited knowledge on statistical method. Apologies if what I ask for does not make any sense. I constructed a large dataset from a sample. This sample is selected using a stratified ...
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Reporting descriptive statistics in case of missing data

I have a dataset of survey responses with 10 variables. 4 of them were optional questions during the survey. Now for ~900 participants, I have missing values for the 4 optional questions, but these ...
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Is an unweighted rolling average useful to overlay on to a daily percentage plot?

The data I have is in the form of customer receipts. Items are grouped into categories such as Dairy, Produce, Meats, etc ... I am putting together a dashboard of information, one plot of which is the ...
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How to approximate a normal distribution?

I want to reduce the space requirement of a probability distribution. I have a main factory with a psychic alarm/monitor that can predict accidents. It pings once per second with continuous variables ...
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Calculating the expected value of the population and the sample experimentally

I am a little bit confused about calculating the Sample Mean vs the mean of the population and proving that the mean of the sample mean is $\mu$ experimentally. Say we have 1000 values of a certain ...
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Gage-R&R for Combined Testing Strategy - Mixing Capable and Uncapable Machines

hi & a good evening to everyone, my company is selling air flow sensors, and due to production variation they have to be end-of-line calibrated before selling them. We have a very fast, high ...
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What statistical test do I use?

I am doing an intervention study, where I have four groups (2 experimental and 2 control). All of the four groups complete an intervention, but the control groups complete this for a smaller amount of ...
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How to visually determine whether bell-shaped curves are normal?

Suppose we have the following three curves and we know that one of them is normal. How can we prove that the other two curves cannot be normal? (We don't have to determine which one of the three ...
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Is interval level of measurement the same as grouped data?

When data is grouped into intervals, will this be considered be as measuring data on the interval scale?
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Duplication of data and effects on various statistics

I recently had a question about the following based on duplication of data: Say you have $x_1, x_2, x_3, ..., x_n$. The t-statistic calculated from this dataset is $t_1$. Now, assume the data was ...
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95 % Quantile for anomaly detection

I'm building a model to detect anomalies in for multivariate data. At first stage I run VAR model every 10 min that predicts the next values, and when I get the values I calculate the Euclidean ...
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What test can I use use to compare variables over time for accidental records of a species?

I have records (presence) for an invasive species, from opportunistic data for 10 years, less than 10 records for each year. I have calculated distances form watercourses, % of land use in buffers and ...
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Sequential Causal Inference Scenario

I am working on a problem where I am trying to estimate the effect of whether event C will occur given the time to B. The following scenarios illustrate the possible paths my system may take. A -> ...
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Test for heteroscedasticity as function of a single independent variable or fitted value?

In tests for heteroscedasticity the residuals have to be monitored. In the literature this is done in different ways in case there is only one independent variable. residuals as function of the ...
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How to estimate mean and variance for rate of change when I only have state data at different ages

I'll give you the intuition behind my problem first. I have data on whether children ($n \approx 200$) can read and their age in integers from 0 to 14. For each age, it is straightforward to ...

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