| Library: | tware |
| See also: | twrandomsample twpvalue twnormalize tw1d twlinreg twclt |
| Macro: | twpearson | |
| Description: | teachware quantlet twpearson gives a visual demonstration of the form of the Pearson correlation coefficient. In particular, it shows why the product moment gives a measure of "dependence", and why it is essential to "normalize", i.e. to subtract means, and divide by standard deviations, to preserve that property. |
| Usage: | twpearson({x}) | |
| Input: | ||
| x | matrix (n x 2) with user defined data | |
; load teachware library
library("tware")
; predefine matrix
x = normal(100,2)
; call twpearson teachware quantlet
twpearson(x)
a two window port display with the scatterplot of the matrix x in the upper port and the values of the product moments in the lower (text) port.
| Library: | tware |
| See also: | twrandomsample twpvalue twnormalize tw1d twlinreg twclt |