Statistical Analysis Stack Exchange
Statistical Analysis Stack Exchange

Questions tagged [age]

36 questions
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2 answers

How to find average and median age from an aggregated frequency table

I am using excel and I am trying to find both the average age and median age. I have two columns. 1 for the category and the other for the number of people in each category. Under 5 6,360 5-9 6,360 10-14 10,986 15-17 …
Frank
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Is there a word for the phenomenon that the old are generally less affected by risk factors?

In epidemiology, this occurs often: Old people are less prone to the influence of risk factors. For example, the Framingham risk score, which tries to estimate cardiovascular risk, gives 8 or 9 points to smokers in their twenties and thirties, but…
miura
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Re-check boxplot after outlier removal

I have a sample of 608 subjects and I need to remove outliers for age. In R, the boxplot appears like this: It shows 74 outliers: > length(boxplot(mydata)$out) [1] 74 After I have removed these outliers, should I take a new look at the boxplot…
this.is.not.a.nick
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Pros and cons of controlling for age when examining effect of cognition on driving performance

I am reviewing some studies on the relationship between cognition and driving. Some studies have controlled for age and some have not (age is correlated with cognition. Can anyone please provide any good references on statistical control I can use…
Jayne
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Getting the optimal age cut off

I am working with a database of diseased and non-diseased patients. I would like to recommend an optimal age cut off for disease screening. The common problem with screening is that it creates a large number of false positive, which is directly…
bluemudpie
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How to treat age-specific left-censored data

I would like to study how the death of a respondent's parent affects his personality (or whatever DV). I have an age of respondent, and also an age when respondent lost his parent. The problem is that these records are available only 23 years back.…
David Pekker
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How to group countries with similar age distributions?

How can I group the world's 200-odd countries into (say) ten groups, with each group's countries having 'similar' age distributions? I want to compare COVID-19 fatality rates across countries. But the proportion of aged is a confounding variable. I…
Happyblue
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Cut off age for mortality data

I have data with death rates for each year 1921 to 2014; and for each age 0 to 110 as below: Age X1921 X1922 X1923 ... 0 0,059987 0,045943 0,055646 1 0,012064 0,008851 0,009971 2 0,005779 0,003822 0,004315 3 …
Cat
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Including both Age and Year in mixed effects model?

Study Longitudinal study of forest GrowthRates across time. 28 plots across 80 years, ~14 samples for each plot. Current model: lmer(GrowthRate ~ I(Year-1970) * factor(PlotType) + (1 + I(Year-1970)|Plot), data = dat) Purpose Determine the…
theforestecologist
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Is it possible to adjust age and gender with binary logistic regression for a continuous dependent variable?

In my study, I have two groups and compared them in terms of blood stem cell levels, which was not distributed normally. For adjusting for age and gender when comparing groups, it is suggested to use regression or ANCOVA in this forum. But my…
karaca
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Survival Analysis - age censoring/bias in independent categorical variables

I suspect that this is a - if not trivial - common question that betrays me as a newbie. Anyhow, here goes... I have data that reflects behaviours of different demographic groups. There are 10 demographic groups, they are predetermined, and…
N Mason
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Interaction of risk factor with age in survival model with age as time scale

I'm currently looking into survival analysis regression models and can't quite wrap my head around the following: Say I want to model time to occurrence of a cardiovascular event and use age (as opposed to follow-up time) as the underlying time…
h_bauer
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Comparing the age distribution of two groups with different sample sizes

I have a dataset regarding a hotel. I am trying to compare the age distribution of two groups: Leisure and business. The sample sizes of these groups are not equal. The business group has 12.4k entries, and the leisure group has 19.6k entries. In…
JackRumble
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Life table based on age groups

I am working on panel attrition (loss of respondents at each wave of follow-up of a longitudinal survey). A multivariate model (discrete-time event history analysis) to analyse panel attrition is discussed in: Watson, D. (2003), ‘Sample Attrition…
maller
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Controlling for age in multiple regression

I am a little stuck on what how to implement and interpret a multiple regression while controlling for age. I am interested in seeing if there is a positive relationship between depression and use of music for emotional regulation and if this…
RandomGuy
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