Questions tagged [mortality]

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19 views

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: ...
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20 views

Lee Carter mortality model - OLS (SVD) estimators if errors are heteroscedastic

In the classical Lee-Carter model, central death rates are modelled as follows: $\log(m(x,t)) = a(x) + b(x)\kappa(t) +\varepsilon(x,t)$ for some $x=0,\ldots,\omega$ and $t=1,\ldots, T$ and where $a(...
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1answer
24 views

How do I calculate standard error for mortality experiment?

I ran an experiment looking if injuries affect the mortality of crabs over 50 days. How do I calculate the standard error for days when crabs died in relation to the percent mortality? Say I start ...
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10 views

life expectancy calculation with high and low continuous variable

I am not a mathematician, and I have a problem with a life expectancy calculation. I have used BaSTA in R to get estimates for mortality from models including different Sites and a continuous ...
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2answers
51 views

Cox regression different results with different combinations of variables

I need help understanding how to use cox hazzard model to calculate risk of death in data from a cohort study. I have a set of data on physical activity and I want to do a cox regression on ...
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1answer
32 views

How to plot mortality at age curve using lifespan data

I have a table with the lifespan of multiple individuals from a species and would like to use this data to plot a mortality rate curve, similar to that shown in figure 1 of this study:https://www....
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67 views

R - matrix optimization problem (Lee-Carter with MLE parameters)

I am trying to reproduce one of models evolved on the base of Lee-Carter model by use of RStudio. Because I am still pretty fresh in this software, my question is not really sophisticated. Applying ...
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117 views

Comparison of extrapolated kaplan-meier survival curve with background mortality

For my research I am doing an health economic assessment of patients with a renal transplant. For my model I need to know their (yearly) mortality probability. My plan was to extrapolate survival data ...
2
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1answer
24 views

How do I determine if the difference between treatment and control is significant when they have different sample sizes?

I am currently performing a test in C. elegans mortality. In my extract and negative control, different sample sizes of worms (25-30 worms) were used due to the degree of difficulty of transferring ...
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118 views

r - Poor model fit with StMoMo package on Human Mortality Database

I am fitting USA mortality data from Human Mortality Database (with data downloaded from here after registering for a free account https://www.mortality.org/cgi-bin/hmd/hmd_download.php) with the ...
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24 views

Mortality rates - can multiple (overlapping) categories with <20 events be combined?

I'm trying to track trends in alcohol/tobacco/drug related deaths for a small, rural county. I have some locally produced stats where they seem to just add the relatively few alcohol and drug related ...
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1answer
37 views

How to define the Lee-Carter model and its constrains in Bayesian setting

I'm running the Bayesian version of Lee-Carter model on jags, using rjags R package. Given a matrix of data $M$ such that $M_{x,t}=\log m_x(t)$ where $m_x(t)$ is ...
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97 views

Convert “Alive” counts per replicate and time to survival data

I have a raw data set describing survival in groups of individuals over time, organized as follows: ...
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1answer
128 views

Converting annual to daily mortality rate

In one excel workbook I am working on right now, the annual mortality rate is given as 3.082% And the formula for calculating the daily mortality rate is 1-EXP(LN(1-[annual mortality rate]/365) Why ...
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84 views

Right-censored cash flows and survival analysis

I am doing survival analysis on a disability claims dataset - each row tells me how long a person has been on claim and whether they have gone off claim yet. Ultimately I am interested in predicting ...
2
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1answer
71 views

Calculating Expected Number of Deaths from Life Tables

Normally, if analysing cohort data, I would expand on time using the Lexis macro (if using SAS) and then calculate the expected number of deaths as the life table central mortality rate (mx) matched ...
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0answers
133 views

How can I compare two standard mortality ratios (SMRs)?

I have a population who I separated into three groups: low, medium, high exposure. I calculated the standard mortality ratios (SMRs) for each of this group using a standard population. One of my ...
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1answer
1k views

What is the best statistical test to compare mortality rates between 2 groups?

I want to compare the mortality rates of 2 groups (control vs treatment). I have binary data (1 = Alive ; 0 = Dead) which gives me a mortality rate (%). What is the best way to compare these 2 ...
3
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1answer
260 views

Excess Mortality versus Relative Mortality

I have modeled the relative mortality of a US cancer cohort, but I want to apply the results to a cohort from the UK (this is the best option as there was no available UK data). Initially I thought ...
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1answer
66 views

Is there a way to set the desired range of an imputation algorithm?

Goal: I am interested to learn if there is a way to set the range of an imputation algorithm for Missing Not at Random (NMAR) data, such as Multiple Imputation or Maximum Likelihood Estimation. ...
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1answer
361 views

analyzing binary mortality data collected at different remeasurement intervals. Bonus for R implementation

I am replicating an analysis that models tree mortality data. Data are structured such that forest sites are revisted at some random interval, which is recorded. It is then determined if a tree lived ...
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2answers
398 views

Logistic or Poisson Regression for Mortality Modelling?

I am attempting to model the probability of death while controlling for a number of other variables. I began to do this with standard logistic regression, but I've come across a number of articles ...
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0answers
30 views

Would a contingency $\chi^2$ test be useful in this case?

I am looking at mortality of caterpillars who were reared on different diets. I have the total number of caterpillars on each diet on the first day of observation, and then again on the final day of ...
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28 views

Crude death rate per 100 subjects per year with missing values and different lengths of follow-up

We need to compute the crude death rate per 100 subjects per year. We have a dataset with 383 observations. The death status is available for every subject, but the length of follow up is different ...
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58 views

Does this analysis make sense and can anyone provide relevent references?

I have a GEE logistic regression model that I've built that predicts that probability of mortality given a rather extensive set of covariates. I wanted to write here as a sanity check of sorts to ...
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1answer
215 views

Parametric Bootstrap without model refitting?

I have a GLM poisson model that makes predictions of the probability of death for every observation in my dataset after fitting the model. I then take the sum or mean of these probabilities to obtain ...
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1answer
6k views

Calculating force of mortality from life table

The force of mortality at age $x+t$, given survival to $x+t$ is given by $\mu_{x+t}$ $=-\frac{d}{dt}[ln({}_{t}p_{x})]$ Given a life table I know how to calculate ${}_{t}p_{x}$, but then how can I ...
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1answer
1k views

Modelling a binary outcome when census interval varies

For a current piece of work I’m trying to model the probability of tree death for beech trees in a woodland in the UK. I have records of whether trees were alive or dead for 3 different census periods ...
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1answer
74 views

Combining Force of Mortality for F and M to find $l_x$

So I have the definition of the force of mortality as $\mu_x=-\frac{1}{l_x}\frac{d l_x}{dx}$ and I am given two different forces of mortality, one for females as $\mu_x^f=0.05(1.2)^x$ and the other ...
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2answers
617 views

Hypothesis testing of two standard mortality ratios

Probably this is an easy question, but I don’t seem to find an answer. The standard mortality ratio (SMR) is defined as “the ratio of actual number of deaths in the group under study to the expected ...