Use the source Luke

Amongst the argy-bargy over the CRU emails over the last 24 hours, have come the expected denials, claims of "being taken out of context" and the usual spin.

As one reader of wattsupwiththat points out, programmers comments in code have to be an honest description of what the program is doing. Comments are there to help the programmers and their successors understand the intention of the program at that point.

A commenter named Neal on climate audit writes:

People are talking about the emails being smoking guns but I find the remarks in the code and the code more of a smoking gun. The code is so hacked around to give predetermined results that it shows the bias of the coder. In other words make the code ignore inconvenient data to show what I want it to show. The code after a quick scan is quite a mess. Anyone with any pride would be to ashamed of to let it out public viewing. As examples [of] bias take a look at the following remarks from the MANN code files:

Here’s the code with the comments left by the programmer:
function mkp2correlation,indts,depts,remts,t,filter=filter,refperiod=refperiod,$
datathresh=datathresh
;
; THIS WORKS WITH REMTS BEING A 2D ARRAY (nseries,ntime) OF MULTIPLE TIMESERIES
; WHOSE INFLUENCE IS TO BE REMOVED. UNFORTUNATELY THE IDL5.4 p_correlate
; FAILS WITH >1 SERIES TO HOLD CONSTANT, SO I HAVE TO REMOVE THEIR INFLUENCE
; FROM BOTH INDTS AND DEPTS USING MULTIPLE LINEAR REGRESSION AND THEN USE THE
; USUAL correlate FUNCTION ON THE RESIDUALS.
;
pro maps12,yrstart,doinfill=doinfill
;
; Plots 24 yearly maps of calibrated (PCR-infilled or not) MXD reconstructions
; of growing season temperatures. Uses “corrected” MXD – but shouldn’t usually
; plot past 1960 because these will be artificially adjusted to look closer to
; the real temperatures.
;

and later the same programming comment again in another routine:
;
; Plots (1 at a time) yearly maps of calibrated (PCR-infilled or not) MXD
; reconstructions
; of growing season temperatures. Uses “corrected” MXD – but shouldn’t usually
; plot past 1960 because these will be artificially adjusted to look closer to
; the real temperatures.


You can claim an email you wrote years ago isn’t accurate saying it was “taken out of context”, but a programmer making notes in the code does so that he/she can document what the code is actually doing at that stage, so that anyone who looks at it later can figure out why this function doesn’t plot past 1960. In this case, it is not allowing all of the temperature data to be plotted. Growing season data (summer months when the new tree rings are formed) past 1960 is thrown out because “these will be artificially adjusted to look closer to the real temperatures”, which implies some post processing routine.

Spin that, spin it to the moon if you want. I’ll believe programmer notes over the word of somebody who stands to gain from suggesting there’s nothing “untowards” about it.

Either the data tells the story of nature or it does not. Data that has been “artificially adjusted to look closer to the real temperatures” is false data, yielding a false result.

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