Commit 07e04f56 authored by Willi Rath's avatar Willi Rath

Move 24 hockey sticks to the front

parent 825445f8
......@@ -130,18 +130,17 @@ repeat what was done.
---
class: center, middle
class: middle, center
## Example — A Simple Time Series?
---
class: center, middle
count: false
class: left, bottom
<img src="images/fig_01_HadISST_global_and_annual_mean_SST_anomalies.png" width="99%">
.center[<img src="images/fig_01_HadISST_global_and_annual_mean_SST_anomalies.png" width="99%">]
_**Figure 01.**_ Annual-mean HadISST anomalies.
.smaller[[This notebook][fig_01_notebook_on_nbviewer] shows the full analysis.]
???
......@@ -150,6 +149,57 @@ surface temperature).
---
class: left, bottom
count: false
.center[<img src="images/fig_02_HadISST_global_and_annual_mean_SST_anomalies_two_variants.png" width="99%">]
.smaller[[This notebook][fig_02_notebook_on_nbviewer] details a subtlety with the _order_ of averaging.]
???
Difference arise from subtleties in treating missing data making sum, mean,
etc. lose strict linearity.
---
class: left, bottom
count: false
.right[.smaller[*... note that we’re still weighting all months equally.*]]
.center[<img src="images/fig_03_HadISST_global_and_annual_mean_SST_anomalies_all_variants.png" width="99%">]
.smaller[[This notebook][fig_03_notebook_on_nbviewer] adds arithmetic averages and shows all 12 variants.]
???
With correctly weighted months, we have 24 curves. (Most of which are arguably
wrong not in no way less likely to be actually used.)
There’s a very nice blog post on [_**informal descriptions**_ vs. _**executable
implementations**_.][Hinsen2017]
---
class: middle, center
count: false
.center[<img src="images/NLA,_HC_Davos_vs._EV_Zug,_19th_October_2014_46.JPG" width="100%">]
.right[.smaller[© [Fabien Perissinotto](https://commons.wikimedia.org/wiki/User:Fabienp)]]
???
Don’t make the mistake of refuting this rather artificial example:
- Simple time series are often used to define indices which then feed composite analyses etc.
- combining only a few indices with two or three reasonable implementations
each is quickly growing to `2^n` or `3^n` possible outcomes.
---
class: top, left
### The Sloppy Way
......@@ -369,73 +419,6 @@ Suppose, this was a multi-author paper. Then, it would be easy
class: middle, left
## Interlude
Let’s compare different ways to calculate the SST anomalies:
.center[<img src="images/fig_01_HadISST_global_and_annual_mean_SST_anomalies.png" width="85%">]
.right[.smaller[*... need your notes*]]
---
count: false
## Interlude - Two Lines
[This notebook][fig_02_notebook_on_nbviewer] details a subtlety with the _order_ of
averaging:
.center[<img src="images/fig_02_HadISST_global_and_annual_mean_SST_anomalies_two_variants.png" width="85%">]
???
Difference arise from subtleties in treating missing data making sum, mean,
etc. lose strict linearity.
---
count: false
## Interlude - Twelve Lines
[This notebook][fig_03_notebook_on_nbviewer] adds arithmetic averages and
shows all 12 variants:
.center[<img src="images/fig_03_HadISST_global_and_annual_mean_SST_anomalies_all_variants.png" width="85%">]
.right[.smaller[*... note that we’re still weighting all months equally.*]]
???
With correctly weighted months, we have 24 curves. (Most of which are arguably
wrong not in no way less likely to be actually used.)
There’s a very nice blog post on [_**informal descriptions**_ vs. _**executable
implementations**_.][Hinsen2017]
---
class: middle, center
count: false
.center[<img src="images/NLA,_HC_Davos_vs._EV_Zug,_19th_October_2014_46.JPG" width="100%">]
.right[.smaller[© [Fabien Perissinotto](https://commons.wikimedia.org/wiki/User:Fabienp)]]
???
Don’t make the mistake of refuting this rather artificial example:
- Simple time series are often used to define indices which then feed composite analyses etc.
- combining only a few indices with two or three reasonable implementations
each is quickly growing to `2^n` or `3^n` possible outcomes.
---
class: middle, left
## Building Repeatable Work Flows
1. Provide a data set containing _**all the numbers**_ necessary to re-plot and
......
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