You gotta think about this one carefully!

Imagine you go to the doctor and get tested for a rare disease (only 1 in 10,000 people get it.)

The test is 99% effective in detecting both sick and healthy people.

Your test comes back positive.

Are you really sick? Explain below 👇

My recommendation to start learning how to deal with structured data: Kaggle's Pandas Tutorial.

• Creating, Reading, Writing
• Indexing, Selecting, Assigning
• Summary Functions, Maps
• Grouping, Sorting
• Data Types, Missing Values
• Renaming, Combining

100% Python 🐍.

A topic that comes up in every interview.

Bias, variance, and their relationship with machine learning algorithms. One of the most basic concepts that you have to know by heart.

Here is a simple summary that you will easily remember.

↓

Every machine learning algorithm deals with 3 types of errors:

1. Bias error
2. Variance error
3. Irreducible error

There's nothing we can do about #3.

Let's focus on the other two.

↓ 1/5

"Bias" refers to the assumptions the model makes to simplify the process of finding answers.

The more assumptions it makes, the more biased the model is.

"Variance" refers to how much the answers given by the model will change if we use different training data.

If the answers stay the same regardless of the data, the model has low variance.

Often, linear models are high-bias, and nonlinear models are low-bias.

Example low-bias algorithms:
• Decision Trees
• SVN
• kNN

Example high-bias algorithms:
• Linear Regression
• Logistic Regression

I sat next to one of the smartest, most successful software engineers in the country for over 10 years.

Here's what I learned.

Fast is 10 times better than good.

9 out of 10 times, a "good enough" solution is all you need to unlock time, money, and attention.

Focus relentlessly on being first. Then take the time to be right.

Fast, then right.

Ship more frequently.

The faster you show your work to your users, the faster you'll hear their feedback, you'll adapt, and you'll ship again.

A question you should ask every day:

What can I do to ship this one day before planned?

Technical debt is a good thing.

Everyone hates technical debt. I think they don't know how to take advantage of it.

When used appropriately, technical debt means working on what truly matters and deferring anything that can wait.

No debt ⟶ You waited too long.

Ask, don't think.

People burn their time every day instead of asking for help.

You don't get extra points for working harder, especially when a little help will make you faster.

Time is your most valuable resource. Don't waste it.

Some of the things I've learned in more than 20 years in the tech industry.

You need to hear these.

🧵👇

Listen to more people who don't look like you, don't speak your language, and don't come from the same place you do.

We aren't doing this near enough.

Small habits compound.

No small improvement is too small.

Just aim for something new every day, and you'll be surprised at the end.

Take responsibility.

It doesn't really matter how you feel, I'm sure you could have done better.

Always keep the big picture in mind and never lose the forest for the trees.

Be the person that pulls everyone out of the rabbit holes.

THIS IS A CATCHY & ATTENTION-GRABBING TITLE

Today, the Province will likely announce what zone of the reopening framework we'll shift into as of Tuesday. Whatever is announced, though, doesn't change what we need to do. Why?

Kindly read these 14 tweets & we'll tell you. (1/14)

Fun fact: COVID-19 does not follow us on Twitter. COVID doesn't know, or particularly care, if we're in the Red or Orange zone.

The behaviours of the virus do not depend on the current ‘zone’ of public health restrictions. And, to be perfectly candid, neither should ours. (2/14)

Once upon a time we used to say #WeAreInThisTogether in our messaging. Here's the thing: we are, but we aren't. Not everyone is experiencing this pandemic the same.

Nurses, doctors, paramedics & healthcare workers have experienced things much differently than most of us. (3/14)

Some people have been home & isolated for months, while others haven't been able to stop working.

Business owners & hospitality workers have been on a rollercoaster of openings & closures.

Students, parents, teachers & school staff have had to adapt to going from online (4/14)

to in-person learning (and back again) numerous times.
And this virus has disproportionately affected some groups more than others.

But there's the thing: while our experiences of this pandemic haven't been shared, we do have a shared goal.

And we can reach it together. (5/14)

I know some people who seem (to me) more concerned with receiving VALIDATION for their mental health issues than solving them.

They seem to care most about other people BELIEVING their problems are real.

I'm curious about this.

Like, it's more important to them that people know how debilitating their anxiety is, than to overcome the anxiety.

Or it's important to them that others believe that they're actually depressed, not "just sad."

Or they want people buy into the narrative that they've been traumatized, and might be something like offended if someone minimizes that.

What do we make of this?

1. One possibility is that if solving the problems seems hopeless or even just really hard, you need external support to be able to cope.

If no one cuts you slack because of your mental health stuff, maybe you're in a really bad place, so you need people to believe you.

ADHD, a thread (1)
If you have #ADHD & are struggling please know you’re not alone. This week on @Overview, we're talking about living w/ ADHD & Anxiety during the pandemic & many the stigmas & misconceptions that making things worse.

I was diagnosed w/ ADHD when I was 7. And in so many ways it’s been a blessing. I love my energy, the hyper-focus, the calm I feel in chaos, the ability to & feel emotions so intensely. It’s allowed me to to see the world differently be in a constant state of wonder.(2)

But realizing all that has been a long, difficult journey so figured I’d share some of my own struggles as well as the resources from @HowtoADHD because Jessica's channel has been a game-changer for me.(3)

First off, #ADHD Attention Deficit Hyperactivity Disorder is a dumb description. It implies a deficit in attention & always hyper people. ADHD is a spectrum, & what we all have in common isn’t that we can’t pay attention. It’s that we have trouble controlling our attention.(4)

There are amazing analogies out there, like trying to watch 6 TV’s at once when someone else controls the remote. Or like driving a race car on city streets and spinning out whenever you try to turn.

I do want to talk a bit about connections, conflicts and information during a pandemic. Since @fordnation insinuated I have COI which I don't, let's take a look at a single instance where @fordnation and Hospital for Sick Children are both making interesting decisions.

Both share a powerful supporter in Peter Gilgan, who has been a great supporter of Sickkids

But his company, Mattamy Homes, has also substantially bankrolled Ontario Proud, which I have reason to believe pushed the Postmedia hit on my reputation.

Sickkids and Mattamy have very close ties. Here is Mary Federau, a longtime Sickkids exec who has moved to Mattamy but remains involved with the Sickkids foundation:

Mary's bio is too modest. It looks as though it has been scrubbed a bit over the last 72 hours. Here's the google cache from Jan 25: