Statistical Methods for Psychology

question that they really wanted to ask, which is whether the relationship between Hassles and Symptoms depends on the degree of ...

coefficients you see that both the centered Hassles and the interaction terms are signifi- cant (p 5 .000 and .037, respectively ...

We have answered our initial questions (social support does moderate the relationship between hassles and symptoms), but it woul ...

Centered Support 215 0 15 Centered 2150 63.245 76.685 90.105 Hassles 0 87.395 89.585 91.755 150 111.545 102.485 93.405 If we plo ...

which the dependent variable is a dichotomy.^14 A very common situation in medicine is the case in which we want to predict resp ...

improved. If we fit a standard regression line to these data, this would be the regression line that fits the probabilityof impr ...

the assumptions of normality and homogeneity of variance in arrays. Rather than classify- ing people as improved or not improved ...

Because the data are censored to provide only success or failure, we have to fit our model somewhat differently. The horizontal ...

For what we are doing here (predicting the odds of surviving breast cancer), we will work with the natural logarithm^16 of the o ...

Start with the line indicating Beginning Block Number 0, and the row labeled “ 2 2 log Likelihood.” At this point there is no pr ...

The next section of the table contains, and tests, the individual predictors. (Here there is only one predictor—SurvRate.) From ...

cancer. They were interested in whether people who experience a high rate of intrusive thoughts (Intrusiv) have a poorer prognos ...

people who exhibit a high level of avoidance behavior do not do as well as those who do less avoiding (Wald chi-square 5 4.3310, ...

There is much more to logistic regression than I can cover in this short introduction, but perhaps the biggest stumbling block t ...

572 Chapter 15 Multiple Regression c. What would we predict in a different city that was identical in every way except that it s ...

15.6 Calculate the adjusted for the data in Exercise 15.4. 15.7 All other things being equal, the ability of two variables to pr ...

574 Chapter 15 Multiple Regression STEP NO. 1 VARIABLE ENTERED 3 X2 MULTIPLE R 0.6215 MULTIPLE R-SQUARE 0.3862 ADJUSTED R-SQUARE ...

Exercises 575 ANALYSIS OF VARIANCE SUM OF SQUARES DF MEAN SQUARE F RATIO REGRESSION 2.9318295 3 0.9772765 4.05 RESIDUAL 1.448170 ...

576 Chapter 15 Multiple Regression b. What effect did the inclusion of PVTotal have on? What effect did it have on the standard ...

15.33 I was surprised to see that frequency of the behavior was not related to the likelihood of reporting. Can you suggest reas ...