Thursday, October 9, 2008

Descriptive Homework

The dataset (and an electronic copy of the assignment) are posted on Portico. Log in, select the My Courses tab, choose Files from the menu on the left, and download the SPPS data file.

9 comments:

JN1906 said...

Am I the only one who cannot download the data set file for our SPSS homework assignment? Whenever I download it, unintelligble language comes up. Perhaps the file needs to be resent.

Susan Sheu said...

I downloaded the dicehw.sav at the Fuller computer lab and it showed lines of symbols and numbers. Any idea on how to fix this?

Mari said...

You must save the file to disk before opening it in SPSS.

For completeness, I'm giving you all the steps, even though I'm sure you got through most of them no problem.

Go to portico and log in.

Select "My Courses."

Select "Files."

Right click on the file, and choose "Save link as."

Save the file to disk (either your hardrive or a jumpdrive or a CD). Take note of where you saved it and what it is called.

Open SPSS.

Choose File --> Open --> Data...
and select the file that you just downloaded.

Chris said...

Question # 2 of the descriptives homework reads as follows: "Compute the z score for each of the following rolls using the appropriate means and standard deviations." A z score implies that we are using a single data-point value, but their is no parameter for "group" listed on the homework, although "die" and "roll" are listed. Does this mean you would like z scores for each roll averaged across groups? Rolls are currently dispersed across 21 groups.

timothykw said...

For those still having difficulty opening the SPSS file, trying saving the file through the Mozilla Firefox browser (rather than through Internet Explorer browser). Firefox will allow you to "save link as"; Internet Explorer will "save target as" and will not work.o

Mari said...

In answer to Chris's question, you are computing the z score for each of the hypothetical values listed.

You are not comparing groups, so you don't need a group variable.

Hint: this is exactly the same thing we did when we computed the z score for Yao Ming's height in class.

Mari said...

How bizarre that Explorer won't let you download the file.

For those of you who have Explorer (and understandably have no desire to install another web browser), there are a couple of other options you can use.

1) If you have WinZip, download the dicehw.zip file from Portico. Note that in this case, you will choose to open the file (NOT "save target as"). Take note of where the file writes to and what it is called.

If you aren't sure if you have WinZip, go ahead and try it...you might be happily surprised to find you have this useful file compression tool loaded on your computer.

2) Get a copy of the data file from one of your classmates who uses a different browser. This form of file sharing is not piracy. :)

3) Send me an email letting me know that you need the dataset and I will reply to that email with the dataset attached. (My email is on your syllabus. Just because I would prefer not to have my email hijacked by a spammer, I am not posting it here.)

Note that if you use this option, I will almost certainly not be on the internet for the remainder of today, and I will probably only check my email once on Saturday and Sunday. I also will not check email late Monday evening.

Andrew said...

I'm trying to save paper and reformatting graphs for size in Word. I was wondering if I need to print off all of the frequency and statistic tables or only the ones I take numbers off of. Also, do I need to print off the detrended normal Q-Q plot graphs as well as the normal Q-Q plot graph or just the normal Q-Q plot graph? Thanks!

Mari said...

I'm all for saving paper.

You may do any (or all) of the following things to reduce the number of trees you use in printing assignments:

Within an SPSS output file, the left panel on the display lists all the analyses you ran, and indicates those that are displayed in the output file with a small icon of an open book. You can doubleclick on any of those icons to close the book, which will suppress that output in your printout. This is a very good thing to do for things like logs, active datasets, and graphs and other elements you don't need for the assignment (e.g., Detrended Normal Q-Q Plots, Case Processing Summaries).

It is not as much of an issue for this particular, but you can also make SPSS fit any given table onto a single page. To do this, first double click on the table in the right panel of the output file. The table will then be outlined in a box with diagonal hash marks around it. Select Format from the menu at the top of the page, then select Table Properties, then select Printing, then check both "Rescale wide table to fit page" and "Rescale long table to fit page." Then click OK.

You may cut and paste elements from the SPSS output file into a word processing file.

Two important caveats about all this, though.

First, don't forget any important part of the output. If you used it to answer the question, I need to see it. If I do not see your output, I cannot help you figure out where you went wrong in an answer.

Second, in your attempts to save paper, do not shrink things to illegible sizes. If I have to squint to read it, I get cranky.

Note that this second caveat also applies to article reviews. I will flex the APA requirement of 12 point, but please, no fonts smaller than 10 point. Margins should be 1 inch. (If you forget to reset Word's default 1.25 inches for left and right, no big deal, but please give me a little room to write comments in!)

For those of you who are concerned about the article review you just turned in, don't worry. You will not be penalized for too small margins or too small type on this assignment. I will expect you to attend to this issue in future assignments, however.