# When to Use a Particular Statistical Test

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1 When to Use a Particular Statistical Test Central Tendency Univariate Descriptive Mode the most commonly occurring value 6 people with ages 21, 22, 21, 23, 19, 21 - mode = 21 Median the center value the formula is N people with ages 21, 22, 24, 23, 19, 21 line them up in order form lowest to highest 19, 21, 21, 22, 23, 24 and take the center value - mode =21.5 Mean the mathematical average the formula is X/N mean age = age of person one + age of person two + age of person three, etc./number of people Variance a measure of how spread out a distribution is it is computed as the average squared deviation of each number from its mean Standard Deviation how much scores deviate from the mean it is the square root of the variance it is the most commonly used measure of spread

2 Differences of Groups Bi- and Multivariate Inferential Statistical Tests Chi Square compares observed frequencies to expected frequencies Is the distribution of sex and voting behavior due to chance or is there a difference between the sexes on voting behavior? t-test looks at differences between two groups on some variable of interest the IV must have only two groups (male/female, undergrad/grad) Do males and females differ in the amount of hours they spend shopping in a given month? ANOVA tests the significance of group differences between two or more groups the IV has two or more categories only determines that there is a difference between groups, but doesn t tell which is different Do SAT scores differ for low-, middle-, and high-income students? ANCOVA same as ANOVA, but adds control of one or more covariates that may influence the DV Do SAT scores differ for low-, middle-, and high-income students after controlling for single/dual parenting? MANOVA same as ANOVA, but you can study two or more related DVs while controlling for the correlation between the DV if the DVs are not correlated, then separate ANOVAs are appropriate Does ethnicity affect reading achievement, math achievement, and overall scholastic th achievement among 6 graders? MANCOVA same as MANOVA, but adds control of one or more covariates that may influence the DV

3 Does ethnicity affect reading achievement, math achievement, and overall scholastic th achievement among 6 graders after controlling for social class? Relationships Correlation used with two variables to determine a relationship/association do two variables covary? does not distinguish between independent and dependent variables Amount of damage to a house on fire and number of firefighters at the fire Multiple Regression used with several independent variables and one dependent variable used for prediction it identifies the best set of predictor variables you can enter many IVs and it tells you which are best predictors by looking at all of them at the same time in sequential regression the computer adds the variables one at a time based on the amount of variance they account for IVs drug use, alcohol use, child abuse DV. suicidal tendencies Path Analysis looks at direct and indirect effects of predictor variables used for relationships/causality Child abuse causes drug use which leads to suicidal tendencies. Group Membership Logistic Regression like multiple regression, but the DV is a dichotomous variable logistic regression estimates the odds probability of the DV occurring as the values of the IVs change What are the odds of a suicide occurring at various levels of alcohol use?

4

5 Statistical Analyses Independent Variables Dependent Variables Control Variables Question Answered by the Statistic # of # of Data Type IVs DVs Type of Data Chi square 1 categorical 1 categorical 0 Do differences exist between groups? t-test 1 dichotomous 1 0 Do differences exist between 2 groups on one DV? ANOVA 1 + categorical 1 0 Do differences exist between 2 or more groups on one DV? ANCOVA 1 + categorical Do differences exist between 2 or more groups after controlling for CVs on one DV? MANOVA 1 + categorical Do differences exist between 2 or more groups on multiple DVs? MANCOVA 1 + categorical Do differences exist between 2 or more groups after controlling for CVs on multiple Dvs? Correlation 1 dichotomous or How strongly and in what direction (i.e., +, -) are 1 0 the IV and DV related? How much variance in the DV is accounted for by Multiple dichotomous or linear combination of the IVs? Also, how strongly regression related to the DV is the beta coefficient for each IV? Path analysis Logistic Regression 1 + categorical or 1 dichotomous 0 What are the direct and indirect effects of predictor variables on the DV? What is the odds probability of the DV occurring as the values of the IVs change?

6 Statistics Decision Tree Research Question Number and type of DV Number and type of IV Covariates Test Goal of Analysis nominal or higher 1 nominal or higher chi square determine if difference between croups 1 dichotomous t-test Group differences 2+ 1 categorical 2+ categorical 1 categorical 2+ categorical one-way anova 1+ one-way ancova factorial anova 1+ factorial ancova one-way manova one-way mancova factorial manova factorial mancova determine significance of mean group differences create linear combo of Dvs to maximize mean group differences Degree of relationship 1 2+ bivariate correlation multiple regression determine relationship/ prediction linear combination to predict the DV path analysis estimate causal relations among variables Prediction of group membership dichotomous 2+ nominal or higher logistic regression create linear combo of IVs of the log odds of being in one group

7 When trying to decide what test to use, ask youself the following... Am I interested in...?: description (association) - correlations, factor analysis, path analysis explanation (prediction) - regression, logistic regression, discriminant analysis intervention (group differences) - t-test, anova, manova, chi square Do I need longitudinal data or is cross-sectional data sufficient for my purpose? Do my hypotheses involve the investigation of change, growth, or the timing of an event? If longitudinal data is necessary, how many data points are needed? (We do not cover these techniques in this class, but your major advisor can direct you to the appropriate procedure.) Is my dependent variable nominal, ordinal, interval, or ratio? nominal - chi square, logistic regression dichotomous - logistic regression ordinal - chi square interval/ratio - correlation, multiple regression, path analysis, t-test, anova, manova, discriminant analysis Do I have moderating or mediating variables? A moderating relationship can be thought of as an interaction. It occurs when the relationship between variables A and B depends on the level of C. A=marital satisfaction B=risk of divorce C=amount of resources High Low Resources Risk of Divorce High Resources Low Low High Marital Satisfaction When resources are low, marital satisfaction doesn t affect divorce, but at high resources, marital satisfaction predicts a greater risk of divorce. A mediating relationship can be thought of as an intervening relationship. It is one in which the path relating A to C is mediated by a third variable (B). We all know that older drivers, up to a point, are safer than younger drivers. But I'm sure that we

8 don t think that the aging (some would say deterioration) of the body, or the mere passage of time, somehow leads to safer driving. What happens, as all right thinking people will agree, is that age leads to wisdom, and wisdom leads to safer drivers. Hence wisdom is the mediating variable that explains the correlation between age and safe driving. (Forget the part about the decline in driving related to being way old, that creates a curvilinear relationship and we re not going there.) Leerkes and Crockenberg (1999) were studying the relationship between how a new mother was raised by her own mother 20+ years before (A=maternal care) and the new mother's level of selfefficacy as a mother (C=self-efficacy). The idea being that if your mother showed high levels of maternal care toward you, you would feel more confident of your ability to mother your own child. Indeed, the correlation between Maternal Care and Self-Efficacy was.272, which is significant at p <.01. But Leerkes expected that this relationship was mediated by self-esteem, such that if you had good maternal care, you will have good self-esteem (B=self-esteem), and if you have good self-esteem, that will, in turn, lead you to have high self-efficacy. A C B When A (maternal care) and C (self-efficacy) are entered into the regression equation, A predicts C. When B (self-esteem) is added to the equation, if B predicts C and the A-C relationship declines in value, that s a mediating/intervening relationship.

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