# It's Not Scientific Parenting Without Graphs

Early last year, we began marking SteelyKid's height off on a door frame in the library. She occasionally demands a re-measurement, and Saturday was one of those days. Which made me notice that we now have a substantial number of heights recorded, and you know what that means: it's time for a graph.

The "featured image" above shows the results, and I've stuck in a zero-day point using her length at birth. The solid line in the graph is a linear fit to the data, because nothing could possibly be wrong with that. According to the fit, we can project that she'll reach a height of 3.0 meters a few months before her twentieth birthday, and since the R2 value is 0.99, you know that's solid science.

Her current height, for the record, I rounded up to 44.5 inches. And if you want to see just how big she's gotten, here's a photo from an after-dinner trip to the playground at what will be her school in just a couple of weeks, when she starts kindergarten. Yikes.

SteelyKid at the top of the rope climber on her school's playground.

I got The Pip to stand by the door frame on Saturday as well, and his official height was 33 inches. As it's a single data point, though, it's not worth graphing-- you'll have to wait until we accumulate more data before we can compare the two in a truly scientific manner...

Tags

### More like this

##### Her Father's Daughter
My parents came up today to go out for dinner for my birthday/ father's day. On the way home, SteelyKid announced that she wanted to go to a playground. We explained that first we needed to go home and get Emmy, and then we would see about going to a playground. SteelyKid then suggested that we…
##### Kid Growth Update
At SteelyKid's softball game today, the Pip provided an ideal cute-kid photo to use as a springboard to some SCIENCE! Or at least, a graph... Anyway, here's the Little Dude showing off how tall he's gotten: The Pip under Kate's coat. OK, really he's hiding under Kate's raincoat (after two…
##### 198-212/366: Kid-Centric Photo Dump
A bunch of stuff happened that knocked me out of the habit of editing and posting photos-- computer issues, travel, catching up on work missed because of travel, and a couple of bouts with a stomach bug the kids brought home. I have been taking pictures, though, and will make an attempt to catch up…
##### Kid Writing Update
One of the things parents of multiple kids often talk about is how they don't end up doing the same things with second children that they did with their first. For example, I carried the weekly Appa-for-scale photos on with SteelyKid for a couple of years, but didn't last anywhere near that long…

Now do an analysis of your grocery bills. *chuckle*

By Wes Morgan (not verified) on 25 Aug 2013 #permalink

Scientific parenting, indeed :-) If you were doing the regular post-natal checkups, you should have a whole bunch of data points up to around day 400 or so, and you'll see that the actual curve down there is roughly logarithmic.

When my daughter was born, I started recording height, weight, and head size in Excel. I also found the raw data from both the CDC and WHO which are used to generate the height-weight curves.

By Michael Kelsey (not verified) on 25 Aug 2013 #permalink

Bee, I don't think this is inconsistent with that burst phase effect. It looks like if you remove the t=0 point and refit the SteelyKid data, you'll get an intercept of 65-ish rather than 50. From the linked chart, burst phase accounts for ca. 10 cm. of height difference.

What we can conclude from this, though, is that Chad is a terrible parent. ;-) Either for malnourishing his kid during a crucial growth phase, or by being negligent enough to skip recording crucial height data during the early period of this experiment. - He really needs to make it up to SteelyKid. Buy her a pony or something. It's safer not to have a 2+ meter tall teen upset at you.

I do have higher-frequency data covering the gap in this graph, from her regular doctor appointments during that span. Those are recorded via a different technique in another data repository, though, and as such I'm saving them for a separate publication.