A list of things we are doing or need to be done.
| Name of Thing | Info about Thing | ETA | Completed? |
| Sitelist | need to list everyone we know | 03.08 | |
| Compost bin | got to fix the door | 03.06 | Yes |
| Sneetches | basic body plan + fabric choices | 10.31 | |
| Make a piece of flat art | I really like this one by pegamoose | 03.16 | |
| Make my own Font | And love it forever | 03.06 | |
| Make a mailbox | A man needs a place for his inbound philatelic samples | 03.20 | |
| Memorize a poem | One stanza a week: This month: Robert Frost’s Two tramps in Mudtime | 05.07 | |
| Program TI-83 | To Calculate Chi-Squared – ah hell yeah. | 03.14 | Yes |
- issues, ideas, comments or criticisms? add to the comments!
Chi-squared, and the associated Probability Density Table, is used to quantify the match between a hypothesis and observed data. Chi-Squared is used a heck of a lot in all sorts of statistical sciences but has become a pain in my life recently because of genetics. So let’s use our TI-83 calculator to crunch the numbers for us.
To make things easy we’ll need three different programs. Let us start with the most basic:
Chi
hit the ‘program’ button (here on callled prgm), then arrow over to the ‘New’ menu and choose ‘Create New’.
name it ‘Chi’ – Enter the following code
Disp "Input Observerd"
Input O
Disp "Input Expected"
Input E
((O-E)^2/E -> C
We now have our Chi-Squared function so now lets make the Probability Density program. Again, create a new program, called ‘ChiTable’ here – and enter the following code:
N-1 -> D
(T^((D/2)-1)*e^(-T/2))/(2^(D/2)*(((N-1)!)*(D/2)))->P
Alright almost done – let’s tie it all together with our main program. Again new program, called here ‘ChiSQR’ – enter the following code:
0->R&8800
0->T
0->N
0->C
0->P
Disp "Number of Sets"
Input N
While R ≠ N
R+1 ->R
prgmCHI
C+T->T
Disp T
End
PrgmCHITABLE
Disp "Probability"
Disp P
Alright – so let’s test it to make sure it works – Hit PRGM, EXEC Tab, Then CHISQR and input the following information:
| Type | Observed | Expected |
| 1 | 62 | 50 |
| 2 | 38 | 50 |
The program should output 2.88 for the first set, then 5.76 for the second and the probability should be .03307……something.
If you don’t get that double check your work.
Purpose:
- Create a Compost Bin, cause buying one is like crazy expensive.
Materials:
- Several lengths of wood
- Blue plastics shipping drum (50 gallon)
- Length of pipe
- Throw Bolt and two hinges
Tools:
- Soldering Iron (not a nice one either)
- saw, nails, screwdriver, measuring tape
Procedure:
1) Create Frame
- Measure wood frame such that length is equal to drum height plus 1 inch on each side. Height of supports as diameter of drum plus three inches.
- Add feet to frame such that length of foot on each side is greater than half the radius of the drum from the center.
- Cut V’s into the vertical supports – these need to be twice as deep as the radius of the axle pipe you are planning to use.
2) Axelize Drum
- Using Soldering Iron burn holes into the top and bottom of drum at the center of the circle
- Throw the length of pipe through from one hole out the next. You measured it first, right?
- A little bit of pipe sticking out should fit well into the vertical supports.
3) Add Door and perforate Drum
- Take a piece of 8.5 X 11 paper and place it so it’s middle is at the middle (height wise) of the drum. Mark the four corners.
- Use the soldering iron to burn out the corners so you can start to saw through it.
- Keep the piece you cut out.
- Reattach the cut piece as the door using the hinges and throw bolt (orientate so that they are on opposite sides from one another.)
- using the soldering iron burn out holes along the drum for aeration – you don’t need to go overboard – maybe a dozen.
Further Projects:
- Have a compost party – seriously it’s just an excuse to get drunk
- Customize the Compost for serious degradation.
Filed under: Uncategorized
Lost Gorilla - last Seen falling out the back of a meat truck
Craig at nevernothing wanted some outlandish advice on scavenger hunts, or he wanted to rub it in that we weren’t in Portland for the one they had planned. Being generous and not paranoid that everyone I know secretly hates me we brought up the point up at a Autoshop.
Filed under: Uncategorized
There are a lot of image generation services out there and I think making new ones is fun – soI’ve thought to smuggle this one from Wordle in through the back door.
I like it but is it Header worthy?
