* working frailty model and plots

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* adding colormap plots

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* adding aft regression models

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* adding more explicit comparison between lifelines, scipy and my estimates

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* extracted correct loglogistic fit removed lifelines models

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* adding some write-up

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* adding more write up and discussion

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* rearranging and adding more description

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* more write up and plot histograms

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* using a gamma prior on the frailty terms

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* running pre-commit checks

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* updated with pre-commit checks

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* added some references and write up

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* added discussion of acceleration factors

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* added conclusion and reference

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* added stratified hazard approach to final model

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* addressing Ben's comments

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* adding fix for inline variable statements

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* adding fix for occurrence typo

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* correcting publication date and tidying

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* more tidying

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* more tidying and change final plot

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* added note about analogy with sorites paradox

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

* addressing Ben's comments

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>

---------

Signed-off-by: Nathaniel <NathanielF@users.noreply.github.com>