1 The Midlife Development Inventory (MIDI) Personality Scales: Scale Construction and Scoring Margie )* Lachman 0 Su3anne L* 4eaver Technical 8eport < =uly 1??@ Arandeis Dniversity Esychology DepartmentG MS H62 4althamG MA H2454N?11H 8esearch supported by The =ohn D* and Patherine T* MacArthur Qoundation esearch Network on Successful Midlife Development MIDMA 2 The MIDI includes 6 personality trait scales: NeuroticismG xtraversionG penness to )xperienceG onscientiousnessG Agreeableness PommunionXG and Agency* These traits were measured using selfNratings of 3H ad]ectives* Most of the ad]ectives were selected from existing trait lists and inventories see emG 1?^1_ GoldbergG 1??2_ ohnG 1??H_ Trapnell igginsG 1??HX_ a few items were generated by Margie Lachman and Alice ossi* or each personality dimensionG a list of all ad]ectives appearing in the literature was compiled =ohnG 1??HX* The ad]ectives which appeared most consistently as markers and had the highest item to total correlations or factor loadings were identified* InitiallyG four ad]ectives were selected to mark each trait dimension* Given the time constraints for MIDIG the goal was to create the shortest possible set of items to measure personality reliably in less than five 5 minutes by telephone or mail survey* A pilot study was conducted in 14 with a probability sample of 1 men and women between the ages of 3H and H* Items with the highest item to total correlations and factor loadings were selected from MIDI* orward regressions were also run to determine the smallest number of items needed to account for over Ha of the total scale variance* Many of the negatively worded items unemotionalG unreliableG unsophisticatedG unsympatheticG shyG unsociableX were dropped due to very low variance* New items were added to increase reliabilities on some scales* Information about the factor loadingsG coefficient alphaG item to total correlations and scale means from the MIDDS sampleG and the scoring algorithm is contained in this document* 3 REFERENCES em S L 11 !"# "&'()*" -",.)/0 2,32*4 alo AltoG A: onsulting sychologists Eress* Goldberg L 12 The development of markers for the igNQive factor structure* 56078)*)9:72* 66"66#",.< G 2642 =ohnG * * 1??HX* The ig ivec factor taxonomy: Dimensions of personality in the natural language and in uestionnaires* In L*A* ervin d*XG >2,?@))A B "/6),2*:.0 8")/0 2,? /"6"2/78< pp 661 New ork: Guilford TrapnellG * D*G igginsG * S* 1??HX* xtension of the Interpersonal Ad]ective Scales to include the ig ive dimensions of personality* D)3/,2* B "/6),2*:.0 ,? )7:2* EF< 1 4 Research Using MIDI Personality Items Mrocek D olar 1 The effect of age on positive and negative affect: A developmental perspective on happiness* D)3/,2* B "/6),2*:.0 ,? )7:2* 6078)*)90< 5 1333134 ElautG *G MarkusG *G LachmanG M* 2HH2X* lace matters: onsensual features and regional variation in American wellNbeing and self* D)3/,2* B "/6),2*:.0 ,? )7:2* 56078)*)90< 3 1614 ErendaG * LachmanG M* 2HH1X* lanning for the future: A life management strategy for increasing control and life satisfaction in adulthood* 16 26216 StaudingerG *G leesonG *G altesG * 1???X* redictors of sub]ective physical health and global wellNbeing: Similarities and differences between the nited States and Germany* D)3/,2* B "/6),2*:.0 ,? )7:2* 6078)*)90< 6 3531 5 MIDI The Midlife Development Inventory Part I uestionnaire The ohn D and atherine T MacArthur oundation esearch Network n Successful Midlife Development 6 @ Scoring fey for MIDI Eersonality Trait Scales Eart I iuestionnaireG Section Q4G p*34 1* Naming of items: An sc prefix was added to all items* )xample: [utgoing is item f4a and is named sf4a 2* Items are reverse scored* An rc suffix is added to the reversed item* All items are reversed T sf4s and sf4x 3* Scales are computed by finding the mean of the items for cases that have valid values for at least half of the items on the particular scale* System missing values should be assigned for cases with fewer than half the items for the scale* or scoring the personality scales the number in the computer code specifies the minimum number of the items reduired* or example M)AN 3 signifies for the agency scale at least 3 items should be completed to count the case as nonNmissing* 4* Qor all scalesG higher values indicate greater endorsement of the construct* ecode sf4a sf4b sf4c sf4d sf4e sf4f sf4g sf4h sf4i sf4 sf4k sf4l Sf4m sf4n sf4o sf4p sf4 sf4r sf4t sf4u sf4v sf4w sf4y sf4 Sf4aa sf4bb sf4cc sf4dd V1k4X 2k3X 3k2X 4k1X into sf4ar sf4br sf4dr sf4er sf4fr sf4gr sf4hr sf4ir sf4r sf4kr sf4r sf4mr sf4nr sf4or sf4pr sf4r sf4rr sf4tr sf4ur sf4vr sf4wr sf4yr sf4r sf4aar sf4bbr sf4ccr sf4ddr Pompute agency mean*3Vsf4erG sf4r sf4r sf4tr sf4ddr ompute agree mean*3sf4br sf4gr sf4lr sf4rr sf43r ompute open mean4sf4nr sf4r sf4ur sf4vr sf4yr sf4bbr sf4ccr ompute nurot mean2sf4cr sf4hr sf4mr sf4s Pompute extrav mean*3Vsf4arG sf4fr sf4kr sf4wr sf4aar ompute consc mean2 sf4dr sf4ir sf4pr sf4x gariable labels agency lsf4 agencym agree lsf4 agreeablenessm neurot lsf4 neuroticismm open lsf4 openness to experiencem consc lsf4 conscientiousnessm extrav lsf4 extraversionm ^ ? .