| Hand in Monday
. (From D&V unless
otherwise
noted)
Scatterplots: p. 130, 5,6 describing simple plots 1,4 what relationship ALSO sketch an appropriate scatterplot for each. 8 Derby (This is actually a timeplot)ALSO, how does the variability change over the decades? 9 Pottery For a, dotplot is ok instead of histo. ALSO, is Batch # really Quantitative, or Ordinal? Postpone the rest; will be part of
Day 14
(Monday) HW (Feel free to
start
it if you want.)
HW in Activstats for SPSS
(Disks are
on reserve in Long; I'll lend one if I'm here): Go to
Chapter
7, use the menu button with the House icon. Scroll thru the
problem
list to find the ones given. In each problem involving data, a
button
will allow you to launch SPSS and open the correct file. Then
save
the file for yourself, do the analysis.
MRA-95-13 (SPSS, and pencil) Corn plants. This is a
first introduction
to the idea of predicting or estimating a "typical" y for a given x
value.
Ch. 8 will do an important special case of that.
|
Read,
to discuss |
Optional |
Relationships:(D&V
Ch 7 thru p.117,
AS7-1&2 )
Handout on SPSS Scatterplots etc.
(D&V Ch. 7-10, AS 7,8,9) pp.1-3,
p.4
govsal_vs_pay.sav is the file
used for most of the handout. (In SPSS for Class 05 folder)
Did 2 categorical variables (2-way tables),
quantitative
vs. categorical (side-by-side boxplots, stemplots, histo's)
Relating 2 quantitative variables: Scatterplots
explanatory = predictor =
independent
=
"x"
= horizontal axis ( = "cause", only
sometimes!)
response = dependent
= "y"
= vertical axis
= ("effect
")
(Living histograms: Height vs. weight, Height vs. gpa)
Timeplot (p.43-4) is special case, "time" on x axis.
Discussing Scatterplot :
Unusual features? Clusters (analyze each
separately)? Outliers? (label
if possible; who?, why?)
For simple cloud, line, or curve:
Form (linear, curved,
...?)
Strength of relationship (how un-scattered)
"Weak, moderate, strong"
Direction
Positively associated: y increases
as x increases (generally).
Negatively associated: y decreases
as
x increases.
Start here Monday
Mark subgroups differently to do comparisons. (Subgroups
defined
by categorical variable, like Sex, Region of country)
Some scatterplot data: educ-v-mortality.sav
, studatsp03.sav
Handout on SPSS Scatterplots etc.
(D&V Ch. 7-10, AS 7,8,9)
govsal_vs_pay.sav is the file
used for most of the handout. (In SPSS for Class 05 folder)
| Sievers home | Math151-Fall05/Dayf12.htm | 2pm | 9/21/05 |