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Questions tagged [population]

A population is a complete set of items that share at least one common characteristic.

183 questions
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WPF, MVVM Populate combobox using another combobox selected item

I have 2 comboboxes that the selected item of the first needs to change the itemsource of the second and it doesn't. Here is my xaml...
Shlomi.K
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SQL Query to get limited number of results based on column entry

I'm struggling with SQL right now. Ive got a table cities that contains the rows id, name, country, population. ID | name | country | population 1 | Shanghai | CN | 14608512 2 | Buenos Aires | AR | 13076300 3 |…
michi
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How to create a custom population generator with the R GA package?

I'm working on an optimsation problem using R's GA package with a 'permutation' type genetic algorithm. I need to introduce some parameters for how the initial population is generated before parents selection and crossover. The reason for this is:…
kenmore17
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is there an R function for pooling data by rows?

I'm fairly new to R and I've been struggling with how to make this work: I'm looking to pool the population numbers across several years (to match a smaller pooled dataset). So instead of having yearly population data, I would combine rows in…
Kmor
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Consumer-resource model with dynamic growth rate in R with deSolve

I have the following 3 main pieces of code that first plots rainfall, then plots rainfall's effect on prey (resource) growth rate, then plots consumer-resource (herbivore-plant) dynamics using a constant growth rate. My goal is to implement the…
Clara
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How to use database table for population of agents with parameter that is name of Space Markup Region parameter (converted from shapefile)?

In Anylogic I used a shapefile to import my own Regions into my GIS map. Then I converted the Shapefile into Space Markup. Now I can see my regions and if I click on it, it displays the correct name with "GIS Region" behind it. (However if I search…
Ella
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How can I take a subsample having almost the same mean and standard deviation of the population?

If this is my data frame: > length <- rep(11:17, 200) > mean(length) [1] 14 > sd(length) [1] 2.001 How can I take a random subsample from the data frame (length) but having almost the same mean and standard deviation?
I. Sam
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Using Bootstrapping when you know that your sample is biased

I have a sample with wage data of which I know it is not representative of the data. To be specific, there are many high-paying wages of pastors but I know that they made up at most like 0.5% of the workforce but like 25% of my sample. Is it…
Simon
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Change position of labels in population pyramid (ggplot2)

I'm having a problem with labeling my population pyramid in R Studio. I would like to adjust the positions of the labels in two different directions, depending on which side they are at. More precisely, I want the values on the left side (males) to…
Keni
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Setting limits to a rnorm function in RStudio

Good evening, Even though I know it will "destroy" an actual normal distribution, I need to set a maximum and a minimum to a rnorm function in R. I'm using survival rates in vultures to calculate population trends and although I need it to…
arnausc
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Monte carlo simulations in R

In the model below (built in R), I want to include 20% population variability on the parameter Rec_den_WT and v and then run Monte Carlo simulations for 100 individuals. So, I want to have a log-normal distribution of these parameters with standard…
Khushhi
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Different color for each populations in cmap

Say I have four arrays and also an x and y array arr1 arr2 arr3 arr4 xarr yarr Each of these 4 arrays has the same length as my x and y array and they each have a value of how "strong" that population is at that particular point in x and y. My plan…
Douglas Grion Filho
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How do I conduct a One-Sample Chi-Squared Test On Population Variance in R?

First of all, I'm aware that I can use var.test(x, y) for inference on the ratio of two population variances, but my question is regarding inference on one population variance. According to this source, I should use the function varTest() to conduct…
Arif AH
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How to Determine the Confidence Interval for a WEIGHTED Population Proportion with R

TASK: COMPUTE THE WEIGHTED SHARES OF MANIFESTATIONS OF A CATEGORICAL VARIABLE AND FIND CONFIDENCE INTERVALS AROUND THOSE WEIGHTED SHARES library(dplyr) set.seed(100) Make up data set with a categorical variable and a weight variable: df <-…
Andi Lope
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How to fix "data will plot plot correctly/data changes"

I created a population model that at points, was doing exactly what I wanted it to do. However, as I began to continue rerunning the code to yield continued correct results, to verify I had done the code correctly, the data would change in an…
Colman Betler
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