# Econometrics Memes and Poems, 2020-2021

Non-credit assignments, *Williams College*, 2021

Memes and Poems by Williams College ECON-255 students, Academic Year 2020-2021

## Meme by Margot Berman ‘22

## Haiku by Sara Sadri ‘23

*Selection Bias: Studying a Lot and Getting a Bad Grade Doesn’t Mean that Studying is Correlated with Lower Grades.*

Those who study more

might be self-selecting to,

because they know less.

## Poem by Emery Zahner ‘22

*A Ballad to the Multiple Regression Model*

As if a single variable were not enough

Multiple regression came along to add more stuff

When used for causal inference

There is one big difference.

MRM hold all other regressors constant

Alas that there not be any conflict

We still seek the change in Y

Only now we have a new ally

Betas still have a meaning

Though now their interpretations need intervening

Independent variables are the best

Cambridge Econometrics operates in Budapest

The interpretation of the intercept is largely the same

Linear regressions are siblings with a like aim

It simply shows where the population line starts on the Y axis

So there is no need to enter anaphylaxis

X two, X three, X four and more,

Multiple Linear Regression is nothing to abhor!

## Poem/adaptation by Tharini Prakash ‘23

*The Non-linear Model Not Taken*

Two models seemed to diverge in a problem set

And sorry I could not use both

And be one economist, I did not fret

Because when I predict values with the coefficients I get,

The logit and probit models show similar growth

Logit and Probit equally lay

In normal or logistic CDFs from zero to one

And while heavier the logit tail may weigh

I know neither model will lead me astray

So long as the data are non-linear, a reasonable prediction will be done

I shall be telling this without hesitation

Somewhere, after econometrics is done and I’ve done my due diligence:

Two models seemed to diverge in a problem set,

I took the probit model for its easier interpretation

And it has not made much difference