Quotes in data
There are three ways to get better figures... Improve the system... Distort the system... Distort the figures
The researcher hoping to break new ground in the theory of experimental design should involve himself in the design of actual experiments. The investigator who hopes to revolutionize decision theory should observe and take part in the making of important decisions.
A man in daily muddy contact with field experiments could not be expected to have much faith in any direct assumption of independently distributed normal errors.
I do not deny that most managers lack a good deal of information that they should have, but I do deny that this is the most important informational deficiency from which they suffer. It seems to me that they suffer more from an overabundance of irrelevant information.
An operational definition is a procedure agreed upon for translation of a concept into measurement of some kind.
Since all models are wrong the scientist must be alert to what is importantly wrong. It is inappropriate to be concerned about mice when there are tigers abroad.
Since all models are wrong the scientist cannot obtain a "correct" one by excessive elaboration. On the contrary following William of Occam he should seek an economical description of natural phenomena. Just as the ability to devise simple but evocative models is the signature of the great scientist so overelaboration and overparameterization is often the mark of mediocrity.
Remember that all models are wrong; the practical question is how wrong do they have to be to not be useful.
The world cannot be understood without numbers. But the world cannot be understood with numbers alone.