( ( If ( ( the factor ) ( is ( an ( independent variable ) ) ) ) ) ( , ( ( a slider ) ( ( will ( appear ( that ( will ( allow ( you ( to ( change ( ( the value ) ( of ( the factor ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (DT the) (NN factor)) (VP (VBZ is) (NP (DT an) (JJ independent) (NN variable))))) (, ,) (NP (DT a) (NN slider)) (VP (MD will) (VP (VB appear) (SBAR (IN that) (S (VP (MD will) (VP (VB allow) (S (NP (PRP you)) (VP (TO to) (VP (VB change) (NP (NP (DT the) (NN value)) (PP (IN of) (NP (DT the) (NN factor))))))))))))) (. .)))
If the factor is an independent variable, a slider will appear that will allow you to change the value of the factor.
(ROOT (S (NP (NP (DT The) (NNS values)) (PP (IN of) (NP (JJ independent) (NNS variables)))) (VP (VBP are) (VP (VBN controlled) (PP (IN by) (NP (NP (DT the) (NN experimenter)) (PP (IN over) (NP (NP (DT the) (NN course)) (PP (IN of) (NP (DT an) (NN experiment))))))))) (. .)))