Generating Excel Charts
I’m about to create a whole bunch of excel charts, and it would be nice if
I could do it automatically. There might be some useful information here
about how to do that.
posted at: 18:22 |
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Program Evaluation
I’m currently doing some program evaluation work at work. Some links
related to that: A guide to
program evaluation, program
evaluation methodologies: a comparative assessment, an interesting
course description for a course on econometric methods, a
program evaluation and research group, a
review of Evaluation Methodology Basics: The Nuts and Bolts of Sound
Evaluation
posted at: 00:15 |
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Style Sheet Layout
I’m setting up a new website with a somewhat comlicated layout. This leads
to the question: nested tables or cascading style sheets?
Here’s a discussion of cascading style sheets, with some comments on
the debate.
posted at: 18:03 |
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Mathematical Notation
I found This
interesting article on notation by Stephen Wolfram, while trying to find
out when people first started using conventional equations.
posted at: 18:22 |
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Making An Invoice
Happily, I finally get to write up an invoice for something. This is good
news.
Here’s
a page with a handy list of items that need to go on an invoice.
posted at: 13:26 |
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Consumer Psychology
Here’s
a nice set of links to consumer psychology sites.
posted at: 12:17 |
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The Scope of a project
Have you ever wondered how to define the scope of a project. It’s pretty
key to a project’s success, I think.
Here’s
a nice bit of information on it.
posted at: 17:15 |
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Mortgage Payment Math Problems
Learn how to do mortgage payment calculations. Check out
this problem. And
take a look at
this
neat site, Debtsmart, that has various “household math problems”.
posted at: 14:32 |
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Compound interest questions
Do you remember doing compound interest questions in high school?
Here’s
a
few more to give you a walk down memory lane. And
here’s
another page.
And yet
another page.
And
here’s
another one.
posted at: 16:23 |
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Bookkeeping
At one point I bought a book at the Staples for keeping track of my
business income and expenses. Since I haven’t learned to use it yet, you
can imagine how active my business has been! However, better late than
never. Here’s
some information from the Government of Canada on basic bookkeeping.
posted at: 15:55 |
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Web Chi Square Calculator
Here’sa
an online chi square calculator, with a report on the results. Very handy.
posted at: 19:40 |
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Pearson and Spearman correlation
Here’s a page
that discusses Pearson and Spearman correlation tests.
posted at: 15:48 |
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Test for Normality
It turns out that you can actually test your data to see if it is or is
not a normal distribution, which seems better than just eyeballing it and
saying to yourself “Hmmm, that doesn’t look like a normal distribution.
Wikipedia has
some
suggestions of normality tests on it’s normality distribution page.
posted at: 14:57 |
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Correlation statistics
Okay- some things in statistics are starting to make sense. I think I’ve
made some sense out of the comparing two groups situation, and using the
chi squared test with the data I have. Now I need to do the same with
correlation- testing to see if one variable is correlated with another
variable. In one case, my data is sort of numerical but sort of not. Here’s an article
that gives a bit of information on that sort of situation.
As usual,
I’m also grappling with the non-normal distribution issue. Here’s a
nice page that details all of the possible things you can do when dealing
with a non-normal distribution. In brief, they are: Sub group averaging,
segmenting data, transforming data, using different distributions,
non-parametric statistics.
posted at: 14:51 |
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Chi Squared
And before I misplace it,
here’s
a useful page about the chi squared test.
posted at: 00:28 |
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Statistics, take two
Okay- sadly, that last statistical test only works for three or more
groups, and I’m only dealing with two groups. So now,
here’s a link for
the Mann whitney test, which compares two groups.
posted at: 00:22 |
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Statistics! Exciting!
Here
is an online Kruskal Wallis test which can be used to determine if two
groups of unknown distribution are the same or different.
posted at: 00:09 |
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Professor Mean
I still seem to know an embarassingly small amount about statistics.
Here’s an
enteraining stats Q&A site, presided over by “Professor Mean”.
posted at: 11:28 |
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Stats tests for non-parametric data
I have to do some statistical analysis of small groups, so I went looking
for statistical tests that will work with small groups that may not be
normally distributed. I found
this useful
page that lists some non-parametric tests that test for the same
things as common parametric tests that require large sample sizes
posted at: 13:27 |
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Erasing stubborn whiteboard marks
We have a whiteboard in our tutoring room which is severly stained. While
looking for information on how to remove whiteboard marker marks, I came
across this page,
with a list of possible whiteboard cleaners at the bottom. Being the AD&D
playing sort myself, I was also entertained by the purpose of the page,
and thought a table and walls covered with white board material sounded
like a great idea. Perhaps others may mock me for my enthusiasm on this
particular topic, however.
posted at: 12:50 |
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Proof that the diagonals of a parallelogram bisect
Here’s
one, but it seems a bit elaborate.
Here’s a
useful hint from Doctor Math.
As suspected, it is also possible to prove using
similar
triangles.
posted at: 12:36 |
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Mathematics across the curriculum
I enjoy hearing about math programs and courses like the ones offered by
dartmouth
college.
posted at: 12:17 |
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Working the problem
Here’s a nice description of the general steps you can use to solve a
problem.
posted at: 09:26 |
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Some Induction Problems
Some example induction problems can be found
here
and
here.
This
pagehas examples and also a nice way of explaining induction by
putting some numbers into the n and n+1 cases.
posted at: 18:56 |
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The most common errors in undergraduate mathematics
Here they
are.
posted at: 17:58 |
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Overcoming Writer’s Block
I’m giving a writing workshop tomorrow evening, and I want to discuss ways
to
overcome writers block when you are trying to do essay assignments.
Here
are some nice tips that look at different reasons why you might be
experiencing writer’s block and how to overcome each type of writer’s
block. Actually, these ideas should come in handy for me as well!
posted at: 10:45 |
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Understanding Assignments
Here
are
some tips on how understand university assignments.
posted at: 19:42 |
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Implicit Differentiation
I sometimes find it hard to remember how implicit differentiation works
Here’s
a good explanation.
posted at: 16:40 |
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Composite Function Sale
According to Google, E-bay is having a composite function sale, with new
and used composite functions. The definition of a composite function can
be found here.
posted at: 16:32 |
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Limit Laws.
More math laws.
Here are the
limit laws.
Here
are some differentiation formulas (not including the chain rule).
posted at: 16:20 |
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Posting signs
I tend to get concerned about the legality of things. I want to post some
signs advertising my tutoring, but I started to wonder if it was actually
legal to post things on telephone poles. Turns out it is.
Here are the details.
posted at: 13:56 |
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Converting from general to standard (vertex) form of a quadratic
Here’s an
explanation of how to do so, in general terms.
posted at: 13:27 |
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Quadratic Quizzes and Quiz Practice Problems
A whole wack of them relevant to the
Ontario Grade 10 Math Curriculum
posted at: 12:49 |
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Summary Sheet for rules of exponents
A
nice summary sheet for rules of exponents and factoring polynomials
posted at: 11:26 |
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College Algebra Tutorials
This
site has a number of nice tutorials on algebra topics, like exponents,
radicals, and simplifying polynomials. It gives the rules and examples
using the rules.
posted at: 11:20 |
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Giving Out Receipts
I’m trying to figure out how to give out receipts for my tutoring
business.
This page
looked promising, but the whole site is so slow I was unable to get to any
other page. I’ll try again later. While looking for other sites, I did
find
this
page, which has a bunch of useful looking forms for businesses on it.
posted at: 11:07 |
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History of Complex Numbers
This site has a nice
discussion of the math history leading up to the use of complex numbers
(and negative numbers as well). I find that knowing the history of math is
very helpful in understanding mathematical concepts.
posted at: 15:58 |
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Imaginary Numbers
Imaginary numbers used to bug me. I didn’t get how you could have a number
the square of which was -1. Now, however, I view math as more of a human
invention than some sort of truth about the world, so the number i doesn’t
bother me as much.
Here’s a
brief discussion on what i is and how it came to be.
posted at: 15:48 |
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Business Plans
I thought I posted some information on my blog a while ago about starting
a business in Ontario but I can’t find any entries on that. Maybe it
was pre-blog. The reason I’m interested is that I want to do some tutoring
and I thought it would be good experience to set the tutoring up as a
business, with a business plan and a registered name and all that. With
that in mind
Here’s
a page from the Ontario government that discusses what needs to be in a
business plan.
Here’s a page
that provides some sample business plans.
posted at: 11:56 |
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Studying Math
I’ve learned a lot about studying math by tutoring math. This page nicely
sums up much of what I have learned. I would also add that to get the most
out of studying you need to do the right sort of problem at the right
time. If you just do a bunch of math problems for the sake of doing the
problems, after you’ve read the chapter, you will get something out of the
experience, I’m sure, but if you do them for a particular reason when you
are feeling a particular motivation (for example if you are motivated to
practice a basic skill because you’ve just learned that you need it in
order to be able to do something more complicated) then you will get more
out of them. I think a lot of doing well in math is digging up the
particular motivations you need to get the material stuck and organized in
your head. That can be really challenging!
posted at: 12:10 |
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All material copyrighted by Jen Schellinck. All rights reserved.